GM Service Manual Online
For 1990-2009 cars only

Diagnostic Routine

Step

Action

Value(s)

Yes

No

Definition: Auxiliary Relay Does Not Energize.

1

  1. Connect a test lamp from CKT 326 (BRN) at the Auxiliary Relay terminal 85 to ground.
  2. Place the ignition switch in RUN.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

Connect a test lamp from CKT 326 (BRN) at the Auxiliary Relay terminal 85 to CKT 327 (BLK) at the Auxiliary Relay terminal 86.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

3

Locate and repair open in CKT 326 or CKT 371 (BRN) between the IP Fuse Block and the Auxiliary Relay.

Is the repair complete?

--

System OK

--

4

Connect a test lamp from CKT 324 (ORN) at the Auxiliary Relay terminal 30 to ground.

Does the test lamp light?

--

Go to Step 6

Go to Step  7

5

Locate and repair open in CKT 21, CKT 327 or CKT 550 (BLK) between the Auxiliary Relay and ground G 105.

Is the repair complete?

--

System OK

--

6

Connect a J 39200 between CKT 325 (PNK) at the Auxiliary Relay and CKT 320 (PNK) or CKT 339 (PNK) at the Body Builder Connector.

Does the DMM indicate continuity?

--

Go to Step 8

Go to Step 9

7

Locate and repair open in CKT 324 (ORN) between the IP Fuse Block and the Auxiliary Relay.

Is the repair complete?

--

System OK

--

8

Replace the Auxiliary relay.

Is the repair complete?

--

System OK

--

9

Locate and repair the open in CKT 320, CKT 325 or CKT 339 (PNK) between Auxiliary Relay and Body Builder Connectors.

Is the repair complete?

--

System OK

--