PZ2470

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The PZM commands the Daytime Running Lamps (DRL) "ON" or "OFF" through a discrete output to the "DRL Relay." The Daytime Running Lamps can only be active when: 1.)The ignition switch is in the "RUN" or "START" position, 2.)Twilight Sentinel is not active, 3.)The headlamps (low and high beam) and front foglamps are "OFF" and 4.)The transmission is not in "PARK." When the relay is energized, it places the High Beams in a series circuit, providing lower illumination for the DRL.

A short to ground will be tested when 1.)Ignition-1 is "ON", 2.)Daytime Running Lamps are inactive and 3.) The Instrument Panel Cluster (IPC) verifies that the vehicle has DRL.

A short to Battery will be tested when l.)Ignition-1 is "OFF" or 2.)Both Ignition-1 Daytime Running Lamps are active and 3.)The IPC verifies that the vehicle has DRL.

DTC WILL SET WHEN

The commanded state of the DRL does not match the feedback.

ACTION TAKEN (BY PZM)

The PZM will continue to command the state requested until it is achieved or changes.

DTC WILL CLEAR WHEN

The commanded state matches the feedback state for two consecutive monitoring cycles.

DTC CHART TEST DESCRIPTION

1. This test determines whether the malfunction is a short to ground or battery.

2. This test determines whether the malfunction is in the wiring or the components.

3. This test checks the "Daytime Running Lamps Relay."

4. This test determines whether the malfunction is in the wiring or the components.

5. This test determines whether the malfunction is in the wiring or the components.