MICU Input Test
NOTE:
Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

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.
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
R9
BLU
Disconnect the gauge control module connector A (32P)
Check for continuity between terminal R9 and gauge control module connector A (32P) terminal No. 31:
There should be continuity.
An open in the B-CAN wire
R10
PNK
Check for continuity between terminal R10 and gauge control module connector A (32P) terminal No. 30:
There should be continuity.
R9
BLU
Disconnect climate control unit 32P connector
Check for continuity between terminal R9 and climate control
unit 32P connector terminal No. 30:
There should be continuity.
An open in the B-CAN wire
R10
PNK
Check for continuity between terminal R10 and climate control unit 32P connector terminal No. 32:
There should be continuity.
R9*1
BLU
Disconnect the power window master switch 37P connector
Check for continuity between terminal R9 and power window master switch 37P connector terminal No. 30:
There should be continuity.
An open in the B-CAN wire
R10*1
PNK
Check for continuity between terminal R10 and power window master switch 37P connector terminal No. 28:
There should be continuity.
R9*2
BLU
Disconnect the automatic lighting control unit/sensor 7P connector
Check for continuity between terminal R9 and automatic lighting control unit/sensor 7P connector terminal No. 7:
There should be continuity.
An open in the B-CAN wire
R10*2
PNK
Check for continuity between terminal R10 and automatic lighting control unit/sensor 7P connector terminal No. 6:
There should be continuity.
R9*3
BLU
Disconnect the automatic lighting/rain sensor 5P connector
Check for continuity between terminal R9 and automatic lighting/rain sensor 5P connector terminal No. 3:
There should be continuity.
An open in the B-CAN wire
R10*3
PNK
Check for continuity between terminal R10 and automatic lighting/rain sensor 5P connector terminal No. 4:
There should be continuity.
R9*4
BLU
Disconnect audio unit connector A (24P)
Check for continuity between terminal R9 and audio unit connector A (24P) terminal No. 2:
There should be continuity.
An open in the B-CAN wire
R10*4
PNK
Check for continuity between terminal R10 and audio unit connector A (24P) terminal No. 4:
There should be continuity.
R9*5
BLU
Disconnect audio unit connector B(20P)
Check for continuity between terminal R9 and audio unit connector B(20P) terminal No. 3:
There should be continuity.
An open in the B-CAN wire
R10*5
PNK
Check for continuity between terminal R10 and audio unit connector B(20P) terminal No. 13:
There should be continuity.
R9*6
BLU
Disconnect audio-navigation unit connector B (20P)
Check for continuity between terminal R9 and audio-navigation unit connector B (20P) terminal No. 3:
There should be continuity.
An open in the B-CAN wire
R10*6
PNK
Check for continuity between terminal R10 and audio-navigation unit connector B (20P) terminal No. 13:
There should be continuity.
R9*7
BLU
Disconnect the power seat control unit connector B (20P)
Check for continuity between terminal R9 and power seat control unit connector B (20P) terminal No. 17:
There should be continuity.
An open in the B-CAN wire
R10*7
PNK
Check for continuity between terminal R10 and power seat control unit connector B (20P) terminal No. 16:
There should be continuity.
R9*8
BLU
Disconnect the immobilizer control unit 7P connector
Check for continuity between terminal R9 and immobilizer control unit 7P connector terminal No. 5:
There should be continuity.
An open in the B-CAN wire
R10*8
PNK
Check for continuity between terminal R10 and immobilizer control unit 7P connector terminal No. 4:
There should be continuity
R9*9
BLU
Disconnect keyless access control unit connector B (28P)
Check for continuity between terminal R9 and keyless access control unit connector B (28P) terminal No. 7:
There should be continuity.
An open in the B-CAN wire
R10*9
PNK
Check for continuity between terminal R10 and keyless access control unit connector B (28P) terminal No. 6:
There should be continuity.
R9*10
BLU
Disconnect Auto high-beam control unit 6P connector
Check for continuity between terminal R9 and Auto high-beam control unit 6P connector terminal No. 3:
There should be continuity.
An open in the B-CAN wire
R10*10
PNK
Check for continuity between terminal R10 and Auto high-beam control unit 6P connector terminal No. 2:
There should be continuity.
R9*11
BLU
Disconnect Parking and back-up sensor control unit 24P connector
Check for continuity between terminal R9 and Parking and back-up sensor control unit 24P connector terminal No. 10:
There should be continuity.
An open in the B-CAN wire
R10*11
PNK
Check for continuity between terminal R10 and Parking and back-up sensor control unit 24P connector terminal No. 22:
There should be continuity.
R9*12
BLU
Disconnect wireless charger 7P connector
Check for continuity between terminal R9 and wireless charger 7P connector terminal No. 2:
There should be continuity.
An open in the B-CAN wire
R10*12
PNK
Check for continuity between terminal R10 and wireless charger 7P connector terminal No. 3:
There should be continuity.
R12
LT BLU
Under all conditions
Check for continuity between terminal R12 and data link connector (DLC) terminal No. 7:
There should be continuity.
An open in the K-LINE wire
*1: With door multiplex control unit
*2: With automatic lighting without automatic wiper
*3: With automatic lighting and automatic wiper
*4: Without display audio
*5: Without navigation with display audio
*6: With navigation
*7: With DPMS
*8: Without keyless access system
*9: With keyless access system
*10: With auto high-beam
*11: With parking back-up sensor
*12: With wireless charger

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
E23
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
An open or high resistance in the 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
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