Door Lock Switch Signal Test
NOTE:
Ensure power door lock harness & connector circuits are okay before testing door lock switch signal. See appropriate POWER DOOR LOCK HARNESS & CONNECTOR CIRCUIT TESTING and POWER DOOR LOCK CIRCUIT VOLTAGE TESTING under POWER DOOR LOCKS CIRCUIT TESTING CHARTS.
Locate power door lock control relay. Ensure control relay 16-pin connector is connected. Using voltmeter positive lead backprobe connector terminal No. 3 (Blue/Red wire). Using voltmeter negative lead backprobe connector terminal No. 4 (Blue/White wire). Ensure voltage increases from zero to battery voltage for approximately 0.2 seconds with door lock manual switch in UNLOCK position. Reverse voltmeter leads and ensure voltage increases from zero to battery voltage for approximately 0.2 seconds with door lock manual switch in LOCK position. If voltage does not change as specified, replace power door lock control relay and retest system.