Keyless/Power Door Locks/Security System Symptom Troubleshooting - AUTO DOOR UNLOCK does not work
AUTO DOOR UNLOCK does not work
NOTE:
Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.
Before testing, check the No. B19 (10 A), No. B20 (10 A), No. B21 (10 A), No. B22 (10 A), No. B23 (10 A), No. B41 (10 A), and No. B42 (20 A) fuses in the under-dash fuse/relay box.
There are two pairs of fuses in the same circuit (No. B21 and No. B23 fuses, No. B20 and No. B41 fuses, No. B19 and No. B22 fuses). If one fuse is blown, make sure to check the other fuse in the same circuit. If necessary, replace the blown fuse(s).
1.
Abnormal circuit check 1:

Abnormal circuit check 1
?1.
Connect the HDS to the data link connector (DLC).

?2.
Select DOOR LOCKS from the BODY ELECTRICAL SYSTEM SELECT menu with the HDS, and enter FUNCTIONAL TESTS.

  

?3.
Select UNLOCK ALL DOORS with the HDS.

Do the door lock actuators work normally?

     
YES
     
     
     
Go to step 12.
     
NO
     
     
     
Driver's door lock circuit: go to step 2.
     
NO
     
     
     
Passenger's door lock circuit: go to step 7.
2.
Open wire check (+B F/BOX MAIN line):

Open wire check (+B F/BOX MAIN line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Test circuit
+B F/BOX MAIN
Test point 1
Under-dash fuse/relay box connector F (18P) No. 1 (RED)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The +B F/BOX MAIN wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
3.
Open wire check (GND line):

Open wire check (GND line)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Under-dash fuse/relay box connector D (44P): disconnected
Under-dash fuse/relay box connector E (36P): disconnected
Test circuit
GND
Test point 1
Under-dash fuse/relay box connector D (44P) No. 16 (BLK)
Test point 2
Body ground

Test circuit
GND
Test point 1
Under-dash fuse/relay box connector E (36P) No. 7 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G401 and/or G601).?
4.
Determine possible failure area (door latch, others):

Determine possible failure area (door latch, others)
?1.
Disconnect the following connector.

?2.
Test the door lock actuator.

Is the door lock actuator OK?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Faulty door lock actuator; replace the door latch.?
5.
Open wire check (DR DOOR UNLOCK line):

Open wire check (DR DOOR UNLOCK line)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Under-dash fuse/relay box connector D (44P): disconnected
Under-dash fuse/relay box connector E (36P): disconnected
Driver's door latch 10P connector: disconnected
Under-dash fuse/relay box connector T (10P): disconnected
Test circuit
DR DOOR UNLOCK
Test point 1
Under-dash fuse/relay box connector T (10P) No. 8 (YEL)
Test point 2
Driver's door latch 10P connector No. 1 (YEL)


Is there continuity?

     
YES
     
     
     
The DR DOOR UNLOCK wire is OK. Go to step 6.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
6.
Open wire check (DR DOOR LOCK line):

Open wire check (DR DOOR LOCK line)
?1.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Under-dash fuse/relay box connector D (44P): disconnected
Under-dash fuse/relay box connector E (36P): disconnected
Driver's door latch 10P connector: disconnected
Under-dash fuse/relay box connector T (10P): disconnected
Test circuit
DR DOOR LOCK
Test point 1
Under-dash fuse/relay box connector T (10P) No. 2 (TAN)
Test point 2
Driver's door latch 10P connector No. 4 (TAN)


Is there continuity?

     
YES
     
     
     
The DR DOOR LOCK wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?
     
NO
     
     
     
Repair an open or high resistance in the wire.?
7.
Open wire check (+B F/BOX MAIN line):

Open wire check (+B F/BOX MAIN line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Test circuit
+B F/BOX MAIN
Test point 1
Under-dash fuse/relay box connector F (18P) No. 1 (RED)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The +B F/BOX MAIN wire is OK. Go to step 8.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
8.
Open wire check (GND line):

Open wire check (GND line)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Under-dash fuse/relay box connector D (44P): disconnected
Under-dash fuse/relay box connector E (36P): disconnected
Test circuit
GND
Test point 1
Under-dash fuse/relay box connector D (44P) No. 16 (BLK)
Test point 2
Body ground

Test circuit
GND
Test point 1
Under-dash fuse/relay box connector E (36P) No. 7 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wire is OK. Go to step 9.
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G401 and/or G601).?
9.
Determine possible failure area (door latch, others):

Determine possible failure area (door latch, others)
?1.
Disconnect the following connector.

?2.
Test the door lock actuator.

Is the door lock actuator OK?

     
YES
     
     
     
Go to step 10.
     
NO
     
     
     
Faulty door lock actuator; replace the door latch.?
10.
Open wire check (R SIDE DOOR UNLOCK line):

Open wire check (R SIDE DOOR UNLOCK line)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Under-dash fuse/relay box connector D (44P): disconnected
Under-dash fuse/relay box connector E (36P): disconnected
Passenger's door latch 10P connector: disconnected
Under-dash fuse/relay box connector S (18P): disconnected
Test circuit
R SIDE DOOR UNLOCK
Test point 1
Under-dash fuse/relay box connector S (18P) No. 6 (RED)
Test point 2
Passenger's door latch 10P connector No. 1 (RED)


Is there continuity?

     
YES
     
     
     
The R SIDE DOOR UNLOCK wire is OK. Go to step 11.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
11.
Open wire check (R SIDE DOOR LOCK line):

Open wire check (R SIDE DOOR LOCK line)
?1.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Under-dash fuse/relay box connector D (44P): disconnected
Under-dash fuse/relay box connector E (36P): disconnected
Passenger's door latch 10P connector: disconnected
Under-dash fuse/relay box connector S (18P): disconnected
Test circuit
R SIDE DOOR LOCK
Test point 1
Under-dash fuse/relay box connector S (18P) No. 3 (BLU)
Test point 2
Passenger's door latch 10P connector No. 4 (BLU)


Is there continuity?

     
YES
     
     
     
The R SIDE DOOR LOCK wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?
     
NO
     
     
     
Repair an open or high resistance in the wire.?
12.
Abnormal circuit check 2:

Abnormal circuit check 2
?1.
Check the parameter(s) below with the HDS when each switch is operating.
MICU
Signal
Current conditions
Value
Unit
A/T Gear Position Switch (P)
    
Driver's Door Lock Knob Switch(UNLOCK)
    
Front Passenger's Door Lock Knob Sw.(UNLOCK)
    

Is each switch information OK?

     
YES
     
     
     
     
NO
     
     
     
Transmission range switch P position circuit troubleshooting: go to step 13.
     
NO
     
     
     
Driver's door lock knob switch circuit troubleshooting: go to step 19.
     
NO
     
     
     
Passenger's door lock knob switch circuit troubleshooting: go to step 25.
13.
Keyless/power door locks/security system check 1:

Keyless/power door locks/security system check 1
?1.
With the transmission range switch in P position, check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
A/T Gear Position Switch (P)
    

Is information indicator ON?

     
YES
     
     
     
Go to step 14.
     
NO
     
     
     
Go to step 16.
14.
Determine possible failure area (transmission range switch, others):

Determine possible failure area (transmission range switch, others)
?1.
Disconnect the following connector.

?2.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
A/T Gear Position Switch (P)
    

Is information indicator OFF?

     
YES
     
     
     
     
NO
     
     
     
Go to step 15.
15.
Shorted wire check (ATP-P line):

Shorted wire check (ATP-P line)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Transmission range switch 10P connector: disconnected
Under-dash fuse/relay box connector E (36P): disconnected
Test circuit
ATP-P
Test point 1
Under-dash fuse/relay box connector E (36P) No. 17 (GRY)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The ATP-P wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?
16.
Keyless/power door locks/security system check 2:

Keyless/power door locks/security system check 2
?1.
Disconnect the following connector.

?2.
Connect terminals A and B with a jumper wire.
Terminal A
Transmission range switch 10P connector No. 5 (BLU)
Terminal B
Body ground


?3.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
A/T Gear Position Switch (P)
    

Is information indicator ON?

     
YES
     
     
     
Go to step 17.
     
NO
     
     
     
Go to step 18.
17.
Open wire check (GND line):

Open wire check (GND line)
?1.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Transmission range switch 10P connector: disconnected
Test circuit
GND
Test point 1
Transmission range switch 10P connector No. 1 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G101).?
18.
Open wire check (ATP-P line):

Open wire check (ATP-P line)
?1.
Connect terminals A and B with a jumper wire.
Terminal A
Under-dash fuse/relay box connector E (36P) No. 17 (GRY)
Terminal B
Body ground


?2.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
A/T Gear Position Switch (P)
    

Is information indicator ON?

     
YES
     
     
     
Repair an open or high resistance in the wire.?
     
NO
     
     
     
The ATP-P wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?
19.
Keyless/power door locks/security system check 1:

Keyless/power door locks/security system check 1
?1.
With the driver's door lock knob switch in LOCK position, check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
Driver's Door Lock Knob Switch(UNLOCK)
    

Is information indicator ON?

     
YES
     
     
     
Go to step 20.
     
NO
     
     
     
Go to step 22.
20.
Determine possible failure area (driver's door latch, others):

Determine possible failure area (driver's door latch, others)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
Driver's Door Lock Knob Switch(LOCK)
    

Is information indicator OFF?

     
YES
     
     
     
Faulty driver's door lock knob switch; replace the driver's door latch.?
     
NO
     
     
     
Go to step 21.
21.
Shorted wire check (DR SILCON UNLOCK line):

Shorted wire check (DR SILCON UNLOCK line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Driver's door latch 10P connector: disconnected
Under-dash fuse/relay box connector P (24P): disconnected
Test circuit
DR SILCON UNLOCK
Test point 1
Under-dash fuse/relay box connector P (24P) No. 10 (LT BLU)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The DR SILCON UNLOCK wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?
22.
Keyless/power door locks/security system check 2:

Keyless/power door locks/security system check 2
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Connect terminals A and B with a jumper wire.
Terminal A
Driver's door latch 10P connector No. 5 (LT BLU)
Terminal B
Body ground


?4.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
Driver's Door Lock Knob Switch(UNLOCK)
    

Is information indicator ON?

     
YES
     
     
     
Go to step 23.
     
NO
     
     
     
Go to step 24.
23.
Open wire check (GND line):

Open wire check (GND line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Driver's door latch 10P connector: disconnected
Test circuit
GND
Test point 1
Driver's door latch 10P connector No. 7 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wire is OK. Faulty driver's door lock knob switch; replace the driver's door latch.?
     
NO
     
     
     
Repair an open or high resistance in the wire or poor ground (G501).?
24.
Open wire check (DR SILCON UNLOCK line):

Open wire check (DR SILCON UNLOCK line)
?1.
Connect terminals A and B with a jumper wire.
Terminal A
Under-dash fuse/relay box connector P (24P) No. 10 (LT BLU)
Terminal B
Body ground


?2.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
Driver's Door Lock Knob Switch(LOCK)
    

Is information indicator ON?

     
YES
     
     
     
Repair an open or high resistance in the wire.?
     
NO
     
     
     
The DR SILCON UNLOCK wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?
25.
Keyless/power door locks/security system check 1:

Keyless/power door locks/security system check 1
?1.
With the passenger's door lock knob switch in LOCK position, check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
Front Passenger's Door Lock Knob Sw.(UNLOCK)
    

Is information indicator ON?

     
YES
     
     
     
Go to step 26.
     
NO
     
     
     
Go to step 28.
26.
Determine possible failure area (front passenger's door latch, others):

Determine possible failure area (front passenger's door latch, others)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
Front Passenger's Door Lock Knob Sw.(UNLOCK)
    

Is information indicator OFF?

     
YES
     
     
     
Faulty passenger's door lock knob switch; replace the passenger's door latch.?
     
NO
     
     
     
Go to step 27.
27.
Shorted wire check (AS SILCON UNLOCK line):

Shorted wire check (AS SILCON UNLOCK line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Passenger's door latch 10P connector: disconnected
Under-dash fuse/relay box connector P (24P): disconnected
Test circuit
AS SILCON UNLOCK
Test point 1
Under-dash fuse/relay box connector P (24P) No. 11 (YEL)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The AS SILCON UNLOCK wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?
28.
Keyless/power door locks/security system check 2:

Keyless/power door locks/security system check 2
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Connect terminals A and B with a jumper wire.
Terminal A
Passenger's door latch 10P connector No. 10 (YEL)
Terminal B
Body ground


?4.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
Front Passenger's Door Lock Knob Sw.(UNLOCK)
    

Is information indicator ON?

     
YES
     
     
     
Go to step 29.
     
NO
     
     
     
Go to step 30.
29.
Open wire check (GND line):

Open wire check (GND line)
?1.
Turn the ignition switch to LOCK (0) or press the engine start/stop button to select the OFF mode.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
Passenger's door latch 10P connector: disconnected
Test circuit
GND
Test point 1
Passenger's door latch 10P connector No. 8 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wire is OK. Faulty passenger's door lock knob switch; replace the passenger's door latch.?
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G506).?
30.
Open wire check (AS SILCON UNLOCK line):

Open wire check (AS SILCON UNLOCK line)
?1.
Connect terminals A and B with a jumper wire.
Terminal A
Under-dash fuse/relay box connector P (24P) No. 11 (YEL)
Terminal B
Body ground


?2.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Value
Unit
Front Passenger's Door Lock Knob Sw.(UNLOCK)
    

Is information indicator ON?

     
YES
     
     
     
Repair an open or high resistance in the wire.?
     
NO
     
     
     
The AS SILCON UNLOCK wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?