Exterior Lights (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, make sure the No. A4 (10 A)*, No. A8 (7.5 A), No. A12-6 (30 A), No. A12-7 (30 A), No. A19 (20 A), No. A21 (10 A), No. A24 (10 A), and No. A25 (10 A) fuses in the under-hood fuse/relay box are OK.
Before testing, make sure the No. B2 (7.5 A), No. B5 (7.5 A), No. B27 (10 A), No. B29 (10 A), and No. B39 (10 A) fuses in the under-dash fuse/relay box are OK.

*: With fog light

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 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 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
E25
·
E14
LT BLU
·
PNK
Connect terminal E25 and ground with a jumper wire
Measure the voltage between terminal E14 and ground:
There should be battery voltage.
Blown No. A19 (20 A) fuse in the under-hood fuse/relay box
Faulty under-hood fuse/relay box
Faulty relay circuit board
An open or high resistance in the wire
E21
BLU
Under all conditions
Connect terminal to ground with a jumper wire:
The left headlight (low beam) should come on.
Blown No. A12-6 (30 A) or No. A25 (10 A) fuse in the under-hood fuse/relay box
Faulty under-hood fuse/relay box
Faulty headlight relay
Blown bulb*1
Faulty left headlight assembly*2
Poor ground (G301) or an open in the ground wire
An open or high resistance in the wire
Connect terminal to ground with a jumper wire:
The right headlight (low beam) should come on.
Blown No. A12-6 (30 A) or No. A24 (10 A) fuse in the under-hood fuse/relay box
Faulty headlight relay
Blown bulb*1
Faulty right headlight assembly*2
Poor ground (G201) or an open in the ground wire
An open or high resistance in the wire
E9
·
F6
PUR
·
LT GRN
Under all conditions
Connect terminals E9 and F6 with a jumper wire:
The left headlight (high beam) should come on.
Blown No. A12-7 (30 A) fuse in the under-hood fuse/relay box
Faulty under-hood fuse/relay box
Blown bulb*1
Faulty left headlight assembly*2
Poor ground (G301) or an open in the ground wire
An open or high resistance in the wire
F12
·
F6
ORN
·
LT GRN
Under all conditions
Connect terminals F12 and F6 with a jumper wire:
The right headlight (high beam) should come on.
Blown No. A12-7 (30 A) fuse in the under-hood fuse/relay box
Faulty under-hood fuse/relay box
Blown bulb*1
Faulty right headlight assembly*2
Poor ground (G201) or an open in the ground wire
An open or high resistance in the wire
E31
YEL
Under all conditions
Connect terminal E31 to ground with a jumper wire:
The left and right front daytime running lights should come on.
Blown No. A8 (7.5 A) fuse in the under-hood fuse/relay box
Faulty under-hood fuse/relay box
Faulty daytime running light relay
Faulty LEDs
An open or high resistance in the wire
E33*3
GRY
Under all conditions
Connect terminal E33 to ground with a jumper wire:
The fog lights should come on.
Blown No. A4 (10 A) fuse in the under-hood fuse/relay box
Faulty LEDs
Faulty fog light relay
An open or high resistance in the wire
*1: Without LED headlight
*2: With LED headlight
*3: With fog light

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
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
An open or high resistance in the wire
F6
LT GRN
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. A12-7 (30 A) fuse in the 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
N18
·
N1
PNK
·
BLK
Combination light switch OFF
Measure the voltage between terminals N18 and N1:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Combination light switch in any position other than OFF
Measure the voltage between terminals N18 and N1:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire
N20
·
N1
GRY
·
BLK
Combination light switch (PARKING position) ON
Measure the voltage between terminals N20 and N1:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Combination light switch OFF
Measure the voltage between terminals N20 and N1:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire
N19
·
N1
YEL
·
BLK
Combination light switch (headlight) ON
Measure the voltage between terminals N19 and N1:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Combination light switch OFF
Measure the voltage between terminals N19 and N1:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire
N17
·
N1
GRN
·
BLK
Combination light switch lever pulled (Passing)
Measure the voltage between terminals N17 and N1:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Combination light switch lever released (OFF)
Measure the voltage between terminals N17 and N1:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire
N16
·
N1
LT BLU
·
BLK
Combination light switch (Dimmer) in high beam position
Measure the voltage between terminals N16 and N1:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Combination light switch (Dimmer) in low beam position
Measure the voltage between terminals N16 and N1:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire
N10*
·
N1
PUR
·
BLK
Fog light switch ON
Measure the voltage between terminals N10 and N1:
There should be less than 0.2 V.
Faulty combination light switch
An open or high resistance in the wire
Fog light switch OFF
Measure the voltage between terminals N10 and N1:
There should be about 5 V.
Faulty combination light switch
A short to ground in the wire
D22
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
*: With fog light