B2472

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The PZM may command the low beams through a discrete output to the low beam relay. Grounding this output also grounds the headlamps input to the instrument cluster.
A Short to ground is tested for under the following conditions:
^ Exterior lamp power is active.
^ Low beam output is inactive.
^ Headlamp switch is not active.
^ DTC B1970 is not active

A short to the battery is tested for under the following conditions:
^ Exterior lamp power is active.
^ Low beam output is active.
^ DTC B1970 is not active.

CONDITIONS FOR SETTING THE DTC
The commanded state of the low beams does not match the feedback state.

ACTION TAKEN WHEN THE DTC SETS
The PZM continues to command the state requested until the instrument cluster revokes the request.

CONDITIONS FOR CLEARING THE DTC
The commanded state matches the feedback state. When the measurements are requested in the diagnostic table below, use the J 39200 Digital Multimeter (DMM) with the correct terminal adapter from the J 35616-A.

When a proper connection is requested, refer to Testing for Intermittent and Poor Connections in Wiring Systems.

When a wire, connector or terminal repair is requested, use the J 38125-B. Refer to Wiring Repairs in Wiring Systems.