Gauge Control Module Input Test
NOTE:
Before testing, do the gauge control module self-diagnostic function, and make sure the B-CAN communication lines are OK.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
Before testing, make sure the No. A29 (10 A) fuse in the under-hood fuse/relay box is OK.
Before testing, make sure the No. B5 (10 A) fuse in the under-dash fuse/relay box is OK.

1.
Turn the vehicle to the OFF (LOCK) mode.

2.
Disconnect the following connector.

Gauge control module connector A (32P)
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
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
A15
GRN
Combination light switch ON
Connect to ground with a jumper wire:
The dashlights should come on full bright.
Faulty LEDs
Faulty bulbs
An open or high resistance in the wire
A16
RED
Combination light switch ON
Connect to ground with a jumper wire:
The dashlights should come on full bright.
Faulty bulbs
An open or high resistance in the wire
A9
BRN
Vehicle ON mode, turn signal switch to LEFT
Measure the voltage to ground:
There should be battery voltage when the lights are flashing.
Faulty MICU
Faulty combination light switch
An open or high resistance in the wire
A10
GRN
Vehicle ON mode, turn signal switch to RIGHT
Measure the voltage to ground:
There should be battery voltage when the lights are flashing.
Faulty MICU
Faulty combination light switch
An open or high resistance in the wire
A5*
GRY
Disconnect the outside air temperature sensor 2P connector
Check for continuity between terminal No. 5 and outside air temperature sensor 2P connector terminal No. 2:
There should be continuity.
An open or high resistance in the wire
Check for continuity between terminal No. 5 and body ground:
There should be no continuity.
A short to ground in the wire
A6
PNK
Disconnect the outside air temperature sensor 2P connector
Check for continuity between terminal No. 6 and outside air temperature sensor 2P connector terminal No. 1:
There should be continuity.
An open or high resistance in the wire
Check for continuity between terminal No. 6 and body ground:
There should be no continuity.
A short to ground in the wire
*: Without climate control

5.
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, replace the gauge control module.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
A1
RED
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. A29 (10 A) fuse in the under-hood fuse/relay box
An open or high resistance in the wire
A17
LT GRN
Vehicle ON mode
Measure the voltage to ground:
There should be battery voltage.
Blown No. B5 (10 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
A32
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
A2
PUR
Vehicle ON mode, ECON switch pushed
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty ECON switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire
Vehicle ON mode, ECON switch released
Measure the voltage to ground:
There should be battery voltage.
Faulty ECON switch
A short to ground in the wire
A25
GRY
Vehicle ON mode, brake fluid is at full level in the reservoir
Measure the voltage to ground:
There should be battery voltage
Faulty brake fluid level switch
A short to ground in the wire
Vehicle ON mode, brake fluid is at lower level in the reservoir
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty brake fluid level switch
Poor ground (G402) or an open in the ground wire
An open or high resistance in the wire
A26
BLU
Vehicle ON mode, parking brake pedal pressed
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty parking brake switch
Faulty parking brake switch ground
An open or high resistance in the wire
Vehicle ON mode, parking brake pedal released
Measure the voltage to ground:
There should be battery voltage.
Faulty parking brake switch
A short to ground in the wire
A27*
YEL
Vehicle ON mode, washer fluid is half or more in the washer reservoir
Measure the voltage to ground:
There should be battery voltage.
Faulty washer fluid level switch
A short to ground in the wire
Vehicle ON mode, washer fluid is empty in the washer reservoir
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty washer fluid level switch
Poor ground (G202) or an open in the ground wire
An open or high resistance in the wire
*: With washer fluid level switch