Pinpoint Test W: An Individual Reversing Lamp Is Inoperative

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 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.

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

REVERSING LAMP CONNECTOR & CIRCUIT REFERENCE

Explorer Lamp Connector-Pin	Mountaineer Lamp Connector-Pin	Circuit
LH C4017-1	LH C451-1	1205 (BK)
RH C4016-1	RH C461-1	1205 (BK)

Is the resistance less than 5 ohms?

Yes : REPAIR circuit 140 (BK/PK). TEST the system for normal operation.
No : REPAIR circuit 1205 (BK). TEST the system for normal operation.