Entry Lights Control System (MICU) Input Test
NOTE: Before testing, make sure the No. B21 (15 A), No. B22 (7.5 A), and No. B29 (10 A) fuses in the under-hood fuse/relay box 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. B21 (15 A), No. B22 (7.5 A), and No. B29 (10 A) fuses in the under-hood fuse/relay box are OK.

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 look 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, then go to step 5.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
D24
PUR
Ceiling light switch in middle position
Connect terminal D24 to ground with jumper wire:
The ceiling light should come on.
Blown No. B22 (7.5 A) fuse in the under-hood fuse/relay box
Blown bulb
Faulty ceiling light
An open or high resistance in the wire

5.
Reconnect the connectors to the under-dash fuse/relay box; 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 (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
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
D3
LT GRN
Driver's door lock knob switch in LOCK
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty driver's door lock knob switch
Poor ground (G401) or an open in the ground wire
An open or high resistance in the wire
Driver's door lock knob switch in UNLOCK
Measure the voltage to ground:
There should be about 5 V.
Faulty driver's door lock knob switch
A short to ground in the wire
D15
WHT
Driver's door lock knob switch in UNLOCK
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty driver's door lock knob switch
Poor ground (G401) or an open in the ground wire
An open or high resistance in the wire
Driver's door lock knob switch in LOCK
Measure the voltage to ground:
There should be about 5 V.
Faulty driver's door lock knob switch
A short to ground in the wire
D4*1
PNK
Ignition key inserted into the ignition key cylinder
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty ignition key switch
Poor ground (G401) or an open in the ground wire
An open or high resistance in the wire
Ignition key removed from the key cylinder
Measure the voltage to ground:
There should be about 5 V.
Faulty ignition key switch
A short to ground in the wire
D4*2
PNK
Disconnect keyless access control unit connector A (32P)
Check for continuity between terminal D4 and keyless access control unit connector A (32P) terminal No. 2:
There should be continuity.
An open or high resistance in the wire
*1: Without keyless access system
*2: With keyless access system