Pinpoint Test W: An Individual Reversing Lamp Is Inoperative

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

W1 CHECK FOR GROUND AT THE INOPERATIVE LAMP

Key in OFF position.
Disconnect: Inoperative Reversing Lamp Connector.

Measure the resistance between the inoperative reversing amp, harness side and ground as follows:

EXPLORER AND MOUNTAINEER CONNECTOR-PIN CIRCUIT DESCRIPTION

Explorer Lamp Connector-Pin	Mountaineer Lamp Connector-Pin	Circuit
LH C4017-1	LHC451-1	1205 (BK)
RH C4016-1	RHC461-1	1205 (BK)

Is the resistance less than 5 ohms?

Yes

REPAIR circuit 140 (BK/PK). TEST the system for normal operation.

REPAIR circuit 1205 (BK). TEST the system for normal operation.