Safety Indicator System (MICU and Gauge Control Module) Input Test
NOTE:
If you are troubleshooting multiple DTCs, be sure to follow the instructions in 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. B21 (15 A) and No. B29 (10 A) fuses in the under-hood fuse/relay box are OK.
Before testing, make sure the No. C34 (7.5 A) fuse in the under-dash fuse/relay box is OK.

MICU

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

2.
Disconnect under-dash fuse/relay box connectors D, H, N, and Q.

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.
With the connectors 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
N23
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
N34
GRN
Front passenger's door open
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty front passenger's door switch
Faulty front passenger's door switch ground
An open or high resistance in the wire
Front passenger's door closed
Measure the voltage to ground:
There should be about 5 V.
Faulty front passenger's door switch
A short to ground in the wire
N39
GRY
Left rear door open
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty left rear door switch
Faulty left rear door switch ground
An open or high resistance in the wire
Left rear door closed
Measure the voltage to ground:
There should be about 5 V.
Faulty left rear door switch
A short to ground in the wire
N37
WHT
Right rear door open
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty right rear door switch
Faulty right rear door switch ground
An open or high resistance in the wire
Right rear door closed
Measure the voltage to ground:
There should be about 5 V.
Faulty right rear door switch
A short to ground in the wire
N26
PNK
Tailgate open
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty tailgate latch switch
Poor ground (G503) or an open in the ground wire
An open or high resistance in the wire
Tailgate closed
Measure the voltage to ground:
There should be about 5 V.
Faulty tailgate latch switch
A short to ground in the wire

5.
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 6.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
Q15
RED
In all power modes
Measure the voltage to ground:
There should be battery voltage.
Blown No. B29 (10 A) fuse in the under-hood fuse/relay box
An open or high resistance in the wire
D23
BLK
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G401)
An open or high resistance in the ground wire
H1
BLK
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G401)
An open or high resistance in the ground wire
N6
BLK
In 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
N38
BLK
In 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
Gauge Control Module

6.
Turn the vehicle to the OFF (LOCK) mode.

7.
Disconnect the gauge control module 32P connector.


8.
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 9.

9.
With the connectors 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 10.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result is not obtained
4
BLU
Parking brake switch ON (Lever pulled)
Measure the voltage to ground:
There should be less than 0.2 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

10.
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 11.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result is not obtained
16
RED
Under all conditions
Measure the voltage to ground:
There should be less than 0.2 V.
Blown No. B29 (10 A) fuse in the under-hood fuse/relay box
An open or high resistance in the wire
15
LT GRN
Vehicle ON mode
Measure the voltage to ground:
There should be battery voltage.
Blown No. C34 (7.5 A) fuse in the under-dash fuse/relay box
An open or high resistance in the wire
17
BLK
In all power modes
Measure the voltage to ground:
There should be battery voltage.
Poor ground (G401)
An open or high resistance in the ground wire

11.
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.