Immobilizer-Keyless Control Unit Input Test
NOTE:
SRS components are located in this area. Review the SRS component locations, and precautions and procedures before doing repairs or servicing.
Before testing, make sure the No. A21 (10 A) fuses in the under-hood fuse/relay box is OK.
Before testing, make sure the No. B5 (7.5 A) fuse in the under-dash fuse/relay box is OK.

1.
Turn the ignition switch to LOCK (0).

2.
3.
Inspect the connector and socket terminals to be sure they are all making good contact:
If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
If the terminals are OK, go to step 4.

4.
With the connector still disconnected, do the following input tests:
If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, go to step 5.

Cavity
Wire
Terminal name
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
2
GRY
S-NET
Jump the SCS line with the HDS, disconnect PCM connector A (51P)
Measure the voltage to ground:
There should be about 5 V.
An open or high resistance in the wire
A short to ground in the wire
Check for continuity between the terminal and PCM connector A (51P) terminal No. 21:
There should be continuity.
Faulty under-dash fuse/relay box
An open or high resistance in the wire
Disconnect the battery negative terminal
Measure the resistance between the terminal and body ground:
There should be more than 50 k?.
Faulty under-dash fuse/relay box
Poor ground (G101)
An open or high resistance in the ground wire

5.
Reconnect the connector to the immobilizer-keyless control unit, and do the following input tests:
If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, replace the immobilizer-keyless control unit.
NOTE: After replacing the immobilizer-keyless control unit, and do the immobilizer key registration.

Cavity
Wire
Terminal name
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
7
WHT
+B BACK UP
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. A21 (10 A) fuse in the under-hood fuse/relay box
An open or high resistance in the wire
6
BRN
IG1 METER
Ignition switch ON (II)
Measure the voltage to ground:
There should be battery voltage.
Blown No. B5 (7.5 A) fuse in the under-dash fuse/relay box
An open or high resistance in the wire
1
BLK
GND
In all ignition switch positions
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G101)
An open or high resistance in the ground wire
3
LT BLU
K LINE
Ignition ON (II).
Measure the voltage to ground:
There should be pulse voltage (digital signal; 8.5 ~ 12 V).
Faulty control unit on the K LINE
Short to ground in the K LINE wire