Schematic Reference: Door Lock/Indicator Schematics

DEFINITION: The driver door lock and the passenger door lock are inoperative in one or both directions.

1

Did you perform the Door Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Door Systems

Verify the fault is present.

Does the system operate as described in the Description and Operation?

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

Go to Step 3

1. Install a scan tool.
2. With a scan tool, observe the Door Lock Switch parameter in the Body Control Module (BCM) Inputs list.

Does the scan tool display Idle?

Go to Step 4

Go to Step 10

Activate both door lock switches to the Lock and Unlock positions.

Did the parameter change to Lock and Unlock with each corresponding press of the switches?

Go to Step 5

Go to Step 12

1. Disconnect the door lock relay connector.
2. Probe the battery positive voltage circuit of the harness connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 18

Connect the test lamp between the battery positive voltage circuit and the ground circuit of the harness connector.

Does the test lamp illuminate?

Go to Step 7

Go to Step 22

Probe the door lock relay Lock control circuit of the harness connector with a test lamp connected to battery positive voltage (B+).

Does the test lamp illuminate?

Go to Step 14

Go to Step 8

With the test lamp still connected between the door lock relay Lock control circuit and B+, LOCK the doors.

Did the test lamp illuminate?

Go to Step 9

Go to Step 15

1. With a test lamp connected to a good ground, probe the lock actuator lock control circuit of the harness connector.
2. Unlock the doors.

Did the test lamp illuminate when you tried to unlock them?

Go to Step 21

Go to Step 24

1. Disconnect one of the door lock switches.
2. With a scan tool, observe the Door Lock Switch parameter in the BCM Inputs list.

Does the scan tool display Idle?

Go to Step 20

Go to Step 11

1. Disconnect the other door lock switch.
2. With a scan tool, observe the Door Lock Switch parameter.

Does the scan tool display Idle?

Go to Step 20

Go to Step 16

1. Disconnect the harness connector of the door lock switch that did not display both Lock and Unlock.
2. Connect a 3 amp fused jumper wire between the switch signal circuit of the inoperative state and a good ground.

Does the scan tool display the inoperative state?

Go to Step 13

Go to Step 17

Connect the 3 amp fused jumper wire between the door lock switch signal circuit of the inoperative state and the ground circuit of the harness connector.

Does the scan tool display the inoperative state?

Go to Step 20

Go to Step 25

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

Did you find and correct the condition?

Go to Step 29

Go to Step 19

Test the door lock relay Lock control circuit for an open or a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 19

Test the lock switch signal circuits for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 19

Test the appropriate lock switch signal circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 19

18

Test the battery positive voltage circuits for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 23

Inspect for poor connections at the harness connector of the body control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 26

Inspect for poor connections at the harness connector of the inoperative door lock switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 27

Inspect for poor connections at the harness connector of the door lock relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 28

Repair the open ground circuit of the door lock relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

--

Repair the short to ground in the power door lock actuator control circuits. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

--

Repair the open in the door lock actuator lock control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

--

Repair the open in the door lock switch ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

--

Replace the body control module. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 29

--

Replace the inoperative door lock switch. Refer to Door Lock Switch Replacement .

Did you complete the replacement?

Go to Step 29

--

Replace the door lock relay.

Did you complete the replacement?

Go to Step 29

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2