GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The endgate lock cylinder switch does not operate. The remote release function on the rear wiper/washer switch does operate correctly.

1

Has the Endgate Release System Check been performed?

--

Go to Step 2

Go to Endgate Release System Check or Endgate Release System Check

2

    • Unlock the RH front door
    • Inspect the MIR/LKS fuse in the underhood fuse block.

Is the fuse good?

--

Go to Step 4

Go to Step 3

3

Locate and repair the short to ground in CKT 840 (ORN), CKT 1221 (WHT/BLK), and/or CKT 56 (BLK/WHT) and replace the fuse.

Is the repair complete?

--

Go to Endgate Release System Check or Endgate Release System Check

--

4

Connect a test lamp from ground to terminal D of the endgate lock cylinder switch.

Does the lamp light?

--

Go to Step 6

Go to Step 5

5

Locate and repair the open in CKT 840 (ORN).

Is the repair complete?

--

Go to Endgate Release System Check or Endgate Release System Check

--

6

Connect a test lamp from ground to terminal C of the endgate lock cylinder switch and depress the switch.

Does the lamp light?

--

Go to Step 8

Go to Step 7

7

Replace the endgate lock cylinder switch

Is the repair complete?

--

Go to Endgate Release System Check or Endgate Release System Check

--

8

Connect a test lamp from ground to connector C3, terminal B of the door lock cylinder switch and depress the endgate lock cylinder switch.

Does the lamp light?

--

Go to Step 10

Go to Step 9

9

Locate and repair the open in CKT 1221 (WHT/BLK).

Is the repair complete?

--

Go to Endgate Release System Check or Endgate Release System Check

--

10

  1. Ensure that the RH door lock cylinder switch is in the unlock postion
  2. Connect a test lamp from ground to connector C3, terminal D of the door lock cylinder switch
  3. Depress the endgate lock cylinder switch

Does the test lamp light?

--

Go to Step 12

Go to Step 11

11

Replace the RH door lock cylinder switch.

Is the repair complete?

--

Go to Endgate Release System Check or Endgate Release System Check

--

12

  1. Ensure that the RH door lock cylinder switch is in the unlock postion
  2. Connect a test lamp from terminal D11 of the body relay block to ground
  3. Depress the endgate lock cylinder switch

Does the test lamp light?

--

--

Go to Step 13

13

Locate and repair the open in CKT 56 (BLK/WHT).

Is the repair complete?

--

Go to Endgate Release System Check or Endgate Release System Check

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