B1970

Circuit Description:
When the Exterior Lamps are commanded "ON," the PZM energizes the Headlamp Relay and the Parklamp Relay through PZM Connector C2 terminals "C9" and "C12," respectively. Power for these relays is Also provided by the PZM through Connector C1 terminal "B10," Exterior Lamp Control. Every 300ms the PZM determines the voltage at these terminals and compares it to the commanded state.

DTC Will Set When:
The exterior lamps have been commanded on for at least 300 ms and the Exterior Lamp Power is "low" for two consecutive monitoring cycles.

Action Taken (By PZM):
The PZM will command the exterior lamps off and attempt to turn the lamps "ON" every 1200 ms until the exterior lamps are no longer required.

DTC Will Clear When:
The exterior lamps are commanded "ON" and the Exterior Lamp Power is active after two consecutive monitoring cycles.

DTC Chart Test Description
1. This test checks to see if the surface-mount fuse in the PZM has opened due to the short to ground on CKT 352 (WHT).