Reminder Systems (MICU and Gauge Control Module) Input Test
NOTE:
Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.
Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A.
Before testing, do the gauge control module self-diagnostic function to make sure the beeper and the indicators in the gauge control module work properly and the F-CAN line are OK.
Before testing, make sure the No. A21 (10 A) fuse 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.

MICU

1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

2.
NOTE: All connector views are shown from the wire side of the female terminals.
3.
Inspect the connectors 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.
Reconnect the connectors to the under-dash fuse/relay box, 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, go to step 5.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
P1
BLK
In all ignition switch positions or all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G501)
An open or high resistance in the ground wire
D30
BLK
In all ignition switch positions or all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G601)
An open or high resistance in the ground wire
D22
BRN
Driver's door open
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty driver's door switch
Faulty driver's door switch ground
An open or high resistance in the wire
Driver's door closed
Measure the voltage to ground:
There should be about 5 V.
Faulty driver's door switch
A short to ground in the wire
P22*1
PNK
Ignition key inserted into the ignition switch
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G502) or an open in the ground wire
Faulty ignition key switch
An open or high resistance in the wire
Ignition switch in LOCK (0) position and ignition key removed from the ignition switch
Measure the voltage to ground:
There should be about 5 V.
Faulty ignition key switch
A short to ground in the wire
P22*2
PNK
Disconnect keyless access control unit connector C (20P)
Check for continuity between terminal P11 and power control unit connector C (36P) terminal No. 5:
There should be continuity.
An open or high resistance in the wire
N18
·
N1
PNK
·
BLK
Combination light switch OFF
Measure the voltage between terminals N1 and N18:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Combination light switch in any position other than OFF
Measure the voltage between terminals N1 and N18:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire
N20
·
N1
GRY
·
BLK
Combination light switch (PARKING position) ON
Measure the voltage between terminals N1 and N20:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Combination light switch OFF
Measure the voltage between terminals N1 and N20:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire
N19
·
N1
YEL
·
BLK
Combination light switch (headlight) ON
Measure the voltage between terminals N1 and N19:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Combination light switch OFF
Measure the voltage between terminals N1 and N19:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire

*1: Without keyless access system
*2: With keyless access system
Gauge Control Module

5.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

6.

7.
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 8.

8.
Reconnect the connector, 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, go to step 9.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
A1
WHT
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
Faulty under-dash fuse/relay box
An open or high resistance in the wire
A17
BRN
Ignition switch ON (II), or power mode ON
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
A4
BRN
In all ignition switch positions or all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G502)
An open or high resistance in the ground wire
A10
LT GRN
Parking brake switch ON (Lever pulled)
Measure the voltage to ground:
There should be less than 1 V.
Faulty parking brake switch
An open or high resistance in the wire
Parking brake switch OFF (Lever released)
Measure the voltage to ground:
There should be about 5 V.
Faulty parking brake switch
A short to ground in the wire

9.
If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU). If input failures are related to a particular control unit, replace the gauge control module.