Auto High-Beam (High-Beam Support System) Control Unit Input Test

NOTE:

	Before testing, check for DTCs. If any DTCs are indicated, troubleshoot the indicated DTCs first.
	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. B5 (7.5 A) fuse in the under-dash fuse/relay box is OK.

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

2.	Disconnect the auto high-beam control unit 6P connector.

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 look OK, go to step 4.

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, faulty auto high-beam control unit; replace the rearview mirror.

Cavity

Wire

Test condition

Test: Desired result

Possible cause if desired result
is not obtained

BRN

Power mode ON

Measure the voltage to ground:
There should be battery voltage.

	Blown No. B5 (7.5 A) fuse in the under-dash fuse/relay box
	An open or high resistance in the wire

BLK

All power modes

Check for continuity to ground:
There should be continuity.

	Poor ground (G501)
	An open or high resistance in the ground wire