All Doors Fail To Lock From Any Switch
NOTE:
Perform POWER DOOR LOCK TEST 1A before proceeding with this test. For connector terminal identification and wiring diagrams, see
BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST: VER-2A after each repair.
CAUTION:
Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
- Using scan tool, monitor door lock switch voltage. If voltage is .2 volts or less, go to next step. If voltage is more than .2 volts, go to POWER DOOR LOCK TEST 2C .
- Remove door lock relay from junction block. See Figure. Junction block is located behind left end cap of instrument panel. See Figure. Using external voltmeter, measure voltage between ground and terminals "D" and "C" (individually) on lock relay socket. If voltage is 10 volts or less, replace junction block. If voltage is more than 10 volts, go to next step.
- Remove unlock relay. Using external ohmmeter, measure resistance between ground and terminal "B"on lock relay socket. If resistance is less than 50 ohms, repair unlock relay output circuit (terminal "B", unlock relay socket) for short to ground. If resistance is 50 ohms or greater, go to next step.
- Connect test light between terminals "A" and "C" on lock relay socket. Using scan tool, actuate door lock relay. If test light flashes during actuation, go to next step. If test light does not flash, replace Body Control Module (BCM). BCM is mounted to junction block.
- Stop actuation. Using external ohmmeter, measure resistance between ground and terminal "E" on unlock relay socket. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, replace junction block.
- Using external ohmmeter, measure resistance between terminals "B" and "E" on unlock relay. If resistance is less than 5 ohms, replace lock relay. If resistance is 5 ohms or greater, replace unlock relay.