Schematic Reference: Door Lock/Indicator Schematics

DEFINITION: This diagnostic should be used to diagnose a complete failure of the power door lock system (lock and unlock). This diagnostic assumes that all the system fuses have been checked for an open and that any shorts to ground in the battery positive voltage circuits have been repaired. If the power door lock system is still inoperative after the battery positive voltage circuits have been repaired and the fuses replaced, continue with the diagnosis.

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Actuate door lock switch to both the lock and unlock positions.

Did both the doors lock and unlock?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Did either of the doors lock and unlock from the switch?

Go to Power Door Lock Inoperative - Driver Door or Power Door Locks Inoperative - Passenger Door

Go to Step 4

1. Install a scan tool.
2. With the scan tool, command the doors to lock and unlock.

Did the doors lock and unlock?

Go to Step 12

Go to Step 5

1. Remove the door lock relay.
2. With a test lamp connected to a good ground, test the battery positive voltage circuits for the door lock relay at the fuse block.

Did the test lamp illuminate?

Go to Step 6

Go to Step 13

With a test lamp connected to B+, test the ground circuits for the door lock relay at the fuse block.

Did the test lamp illuminate?

Go to Step 7

Go to Step 14

Connect a test lamp between the door lock actuator lock circuit at the fuse block and a good ground.

Did the test lamp illuminate?

Go to Step 8

Go to Step 9

1. Remove the door unlock relay.
2. Connect a test lamp between the door unlock relay control circuit and B+.

Did the test lamp illuminate?

Go to Step 11

Go to Step 16

1. With a test lamp still connected between the door lock actuator lock circuit at the fuse block and a good ground.
2. Actuate a door lock switch to the unlock position.

Did the test lamp illuminate?

Go to Step 15

Go to Step 10

1. Install the door lock relay.
2. Remove the door unlock relay.
3. Connect a test lamp between the door lock actuator unlock circuit at the fuse block and a good ground.
4. Actuate a door lock switch to the lock position.

Did the test lamp illuminate?

Go to Step 16

Go to Step 17

Test for a short to ground in the door unlock relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 18

Test for an open in the door lock switch ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

--

Repair the open or short to ground in the battery positive voltage supply circuit between the LOCK fuse and the door lock and unlock relays. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 19

--

Repair the open in the ground circuit for the door lock and unlock relays. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 19

--

Replace the door lock relay.

Did you complete the repair?

Go to Step 19

--

Replace the door unlock relay.

Did you complete the repair?

Go to Step 19

--

Repair the open in the door lock actuator lock and/or unlock circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 19

--

Replace the body control module (BCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the repair?

Go to Step 19

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 4