GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Jimmy - 2WD 🢒 Body and Accessories 🢒 Doors 🢒 Power Door Locks Inoperative - All Doors and Switches

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Door Locks System Check?

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Go to Step 2

Go to Power Door Locks System Check

2
  1. Install the scan tool.
  2. Turn the engine OFF.
  3. Turn the ignition switch to the RUN position.

Are any codes present in the BCM?

--

Go to Diagnostic Trouble Code (DTC) List/Type in Body Control Systems

Go to Step 3

3

Inspect the MIR/LKS fuse 7 at the underhood fuse block.

Is the fuse open?

--

Go to Step 4

Go to Step 18

4

Connect a test lamp between the MIR/LKS fuse terminal B6 and terminal C5 in the underhood fuse block.

Do not remove the test lamp until the end of the test.

Does the test lamp light?

--

Go to Step 5

Go to Step 9

5

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative terminal of the battery.
  2. Remove the body relay block connector.
  3. Reconnect the negative battery terminal.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

6
  1. Repair a short to ground in CKT 840 (ORN) between MIR/LKS fuse 7 and the body relay block.
  2. Reinstall the connector to the body relay block.

Is the repair complete?

--

Go to Power Door Locks System Check

--

7

With the body relay block disconnected, connect a test lamp between MIR/LKS fuse terminal B6 and terminal F12 (also terminal F10 on utility only) of CKT 840 (ORN) at the body relay block connector.

Does the test lamp light?

--

Go to Step 8

Go to Step 32

8

Repair short to ground in CKT 840 (ORN).

--

Go to Power Door Locks System Check

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9

Press the driver door lock switch.

Does the test lamp light?

--

Go to Step 10

Go to Step 11

10

Repair the short to ground in CKT 195 (LT BLU).

Is the repair complete?

--

Go to Power Door Locks System Check

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11

Press the driver door unlock switch.

Does the test lamp light?

--

Go to Step 12

Go to Step 13

12

Repair the short to ground in CKT 194 (WHT).

Is the repair complete?

--

Go to Power Door Locks System Check

--

13

Press the passenger door lock switch.

Does the test lamp light?

--

Go to Step 14

Go to Step 15

14

Repair a short to ground in CKT 195 (LT BLU).

Is the repair complete?

--

Go to Power Door Locks System Check

--

15

Press the passenger door unlock switch.

Does the test lamp light?

--

Go to Step 16

Go to Step 17

16

Repair a short to ground in CKT 194 (WHT).

Is the repair complete?

--

Go to Power Door Locks System Check

--

17

Replace the MIR/LKS fuse.

Is the repair complete?

--

Go to Power Door Locks System Check

--

18

Check for open in CKT 1850 (BLK) between terminal C8 of the body relay block and G200.

Is CKT 1850 (BLK) open?

--

Go to Step 19

Go to Step 20

19

Repair the open in CKT 1850 (BLK).

Is the repair complete?

--

Go to Power Door Locks System Check

--

20

Disconnect the door unlock relay in the body relay block. Check for open between terminal 4 at the relay and terminal C8 of the body relay block.

Is there an open?

--

Go to Step 32

Go to Step 21

21
  1. Use a scan tool in order to monitor the state of the door unlock relay feedback CKT 194 (WHT).
  2. Press the driver door unlock switch.

Does the door unlock relay feedback signal change to ON?

--

Go to Step 22

Go to Step 23

22

Inspect the PWR LKS fuse 14 for an open.

Is the fuse open?

--

Go to Step 24

Go to Step 28

23

Repair an open in CKT 194 (WHT).

Is the repair complete?

--

Go to Power Door Locks System Check

--

24

Connect a test lamp between the IP fuse block PWR LKS fuse 14 terminal D4 and terminal E3.

Do not remove the test lamp until the end of the test.

Does the test lamp light?

--

Go to Step 25

Go to Step 27

25
  1. Remove the following relays:
    2. • The left door unlock relay
    • The door lock relay
    • The door unlock relay
  2. Observe the test lamp in order to note if the lamp goes out when each relay was removed.
  3. Replace the relay as needed.

Does the test lamp remain lighted?

--

Go to Step 29

Go to Step 27

26

Repair the short to ground in CKT 1740 (ORN).

Is the repair complete?

--

Go to Power Door Locks System Check

--

27
  1. Replace the PWR LKS fuse 14.
  2. Inspect the system.

Is the system operating correctly?

--

Go to Power Door Locks System Check

--

28

Repair an open in CKT 1740 (ORN).

Is the repair complete?

--

Go to Power Door Locks System Check

--

29

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative terminal of the battery.
  2. Disconnect the body relay block connector.
  3. Reconnect the negative battery terminal.

Does the test lamp light?

--

Go to Step 26

Go to Step 30

30

With the body relay block disconnected. Check for short to ground at the body relay block connector in CKT 694 (TAN) terminal E10, CKT 295 (GRY) terminal C9, and CKT 294 (TAN) terminal D8.

Is there a short to ground?

--

Go to Step 31

Go to Step 32

31

Repair the short to ground in appropriate circuit.

Is the repair complete?

--

Go to Power Door Locks System Check

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32

Replace the body relay block.

Is the repair complete?

--

Go to Power Door Locks System Check

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