Automatic Lighting Control Unit-Sensor Input Test
NOTE: Before testing, make sure the No. B29 fuse is OK.

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

2.
Disconnect the automatic lighting control unit-sensor connector.
USA and Canada models

Mexico models
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 connector still disconnected, do the following input tests:
If any test indicates a problem, find and correct the cause, then recheck the system.
If the terminals are OK, go to step 5.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
5
WHT
Disconnect under-dash fuse/relay box connector B (20P)
Check for continuity between terminal No. 5 and under-dash fuse/relay box connector B (20P) terminal No. 11:
There should be continuity.
An open or high resistance in the wire

5.
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, replace the automatic lighting control unit-sensor.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
4*1
1*2
RED
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. B29 fuse
Faulty under-dash fuse/relay box
An open or high resistance in the wire
3*1
4*2
BLK
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G403)
An open or high resistance in the ground wire
*1: USA and Canada models
*2: Mexico models