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.
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.

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

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 the terminals are OK, go to step 5.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
A15
TAN
Combination light switch ON
Connect to ground with a jumper wire:
The dashlights should come on full bright.
Faulty LEDs
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
A24
BLU
Ignition switch ON (II) or power mode ON, 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
A25
GRN
Ignition switch ON (II) or power mode ON, 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

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
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-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
Faulty under-dash fuse/relay box
An open or high resistance in the 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
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
A11
GRN
Ignition switch ON (II) or power mode ON, brake fluid is at full level in the reservoir
Measure the voltage to ground:
There should be about 5 V.
Faulty brake fluid level switch
A short to ground in the wire
Ignition switch ON (II) or power mode ON, 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 (G301) or an open in the ground wire
An open or high resistance in the wire
A5*
BLU
Ignition switch ON (II) or power mode ON, washer fluid is half or more in the washer reservoir
Measure the voltage to ground:
There should be about 5 V.
Faulty washer fluid level switch
A short to ground in the wire
Ignition switch ON (II) or power mode ON, 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 (G201) or an open in the ground wire
An open or high resistance in the wire
A10
LT GRN
Ignition switch ON (II) or power mode ON, parking brake lever pulled
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
Ignition switch ON (II) or power mode ON, parking brake lever released
Measure the voltage to ground:
There should be about 5 V.
Faulty parking brake switch
A short to ground in the wire
A8
WHT
Ignition switch ON (II) or power mode ON, ECON button pushed
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty ECON switch
Poor ground (G502) or an open in the ground wire
An open or high resistance in the wire
Ignition switch ON (II) or power mode ON, ECON button released
Measure the voltage to ground:
There should be about 5 V.
Faulty ECON switch
A short to ground in the wire
*: Canada model