MICU 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, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
Before testing, make sure the No. B21 and No. B29 fuses are OK.

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

2.
Disconnect under-dash fuse/relay box connectors D, G, 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
G2
BLU
Disconnect the gauge control module 32P connector
Check for continuity between terminal G2 and gauge control module 32P connector terminal No. 24:
There should be continuity.
An open in the B-CAN wire
G3
PNK
Check for continuity between terminal G3 and gauge control module 32P connector terminal No. 23:
There should be continuity.
G2*7
BLU
Disconnect the climate control unit 32P connector
Check for continuity between terminal G2 and climate control unit 32P connector terminal No. 21:
There should be continuity.
An open in the B-CAN wire
G3*7
PNK
Check for continuity between terminal G3 and climate control unit 32P connector terminal No. 19:
There should be continuity.
G2*5
BLU
Disconnect the automatic lighting control unit-sensor 5P connector
Check for continuity between terminal G2 and automatic lighting control unit-sensor 5P connector terminal No. 2:
There should be continuity.
An open in the B-CAN wire
G3*5
PNK
Check for continuity between terminal G3 and automatic lighting control unit-sensor 5P connector terminal No. 1:
There should be continuity.
G2*6
BLU
Disconnect the automatic lighting control unit-sensor 7P connector
Check for continuity between terminal G2 and automatic lighting control unit-sensor 7P connector terminal No. 7:
There should be continuity.
An open in the B-CAN wire
G3*6
PNK
Check for continuity between terminal G3 and automatic lighting control unit-sensor 7P connector terminal No. 6:
There should be continuity.
G2*1
BLU
Disconnect the immobilizer-keyless control unit 7P connector
Check for continuity between terminal G2 and immobilizer-keyless control unit 7P connector terminal No. 5:
There should be continuity.
An open in the B-CAN wire
G3*1
PNK
Check for continuity between terminal G3 and immobilizer-keyless control unit 7P connector terminal No. 4:
There should be continuity.
G2*2
BLU
Disconnect keyless access control unit connector C (20P)
Check for continuity between terminal G2 and keyless access control unit connector C (20P) terminal No. 11:
There should be continuity.
An open in the B-CAN wire
G3*2
PNK
Check for continuity between terminal G3 and keyless access control unit connector C (20P) terminal No. 1:
There should be continuity.
G2*3
BLU
Disconnect audio unit connector A (24P)
Check for continuity between terminal G2 and audio unit connector A (24P) terminal No. 24:
There should be continuity.
An open in the B-CAN wire
G3*3
PNK
Check for continuity between terminal G3 and audio unit connector A (24P) terminal No. 14:
There should be continuity.
G2*4
BLU
Disconnect audio-navigation unit connector A (24P)
Check for continuity between terminal G2 and audio-navigation unit connector A (24P) terminal No. 24:
There should be continuity.
An open in the B-CAN wire
G3*4
PNK
Check for continuity between terminal G3 and audio-navigation unit connector A (24P) terminal No. 14:
There should be continuity.
G2*8
BLU
Disconnect the multipurpose camera unit 20P connector
Check for continuity between terminal G2 and multipurpose camera unit 20P connector terminal No. 17:
There should be continuity.
An open in the B-CAN wire
G3*8
PNK
Check for continuity between terminal G3 and multipurpose camera unit 20P connector terminal No. 6:
There should be continuity.
D13
LT BLU
Under all conditions
Check for continuity between terminal D13 and data link connector (DLC) terminal No. 7:
There should be continuity.
An open in the K LINE wire
*1: Without keyless access system
*2: With keyless access system
*3: Without navigation
*4: With navigation
*5: USA and Canada models
*6: Mexico models
*7: With climate control
*8: With multipurpose camera unit

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, the MICU must be faulty; replace the under-dash fuse/relay box.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
Q15
RED
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. B29 fuse
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