Automatic Lighting Control Unit-Sensor (2019 2020 2021 2022)

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. A29 fuse is OK.

1. Press the engine start/stop button to select the OFF mode.

2. Disconnect the automatic lighting control unit-sensor 5P connector.

Courtesy of HONDA, U.S.A., INC.

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.

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 resultis not obtained
5	PNK	Disconnect under-dash fuse/relay box connector T (20P)	Check for continuity between terminal No. 5 and under-dash fuse/relay box connector T (20P) terminal No. 2:There should be continuity.	An open or high resistance in the wire

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 resultis not obtained
4	GRN	Under all conditions	Measure the voltage to ground:There should be battery voltage.	Blown No. A29 fuse Faulty under-dash fuse/relay box An open or high resistance in the wire
3	BLK	In all power modes	Measure the voltage to ground:There should be less than 0.2 V.	Poor ground (G506) An open or high resistance in the ground wire