GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the BCM Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - Body Control System in Body Control System

2

Did you review the audible warnings system operation and perform the necessary inspections?

--

Go to Step 3

Go to Audible Warnings Circuit Description

3

Verify that the chime is inoperative.

Does the chime operate normally?

--

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

Go to Step 4

4

  1. Turn the ignition switch to the RUN position. Do not turn the engine on.
  2. Using a digital multimeter (DMM) connected to ground, backprobe the BCM connector C1 cavity B2 on CKT 39.
  3. Measure the voltage.

Is battery voltage measured?

B+

Go to Step 5

Go to Step 10

5

  1. Turn the ignition switch to the RUN position. Do not turn the engine on.
  2. Using a digital multimeter (DMM) connected to ground, backprobe the BCM connector C1 cavity A1 and cavity B1 on CKT 1850.
  3. Measure the voltage.

Is the voltage measured less than the specified value?

60 mV

Go to Step 6

Go to Step 11

6

  1. Turn the ignition switch to the RUN position. Do not turn the engine on.
  2. Using a digital multimeter (DMM) connected to ground, backprobe the BCM connector C1 cavity A2 on CKT 1140.
  3. Measure the voltage.

Is battery voltage measured?

B+

Go to Step 7

Go to Step 12

7

Inspect the connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Are the connections in need of repair?

--

Go to Step 8

Go to Step 9

8

Repair the connections at the BCM as necessary. Refer to Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

--

9

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Is the repair complete?

--

Go to Step 13

--

10

Locate and repair the open or high resistance in CKT 39 between the BCM and the IP fuse block. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

--

11

Locate and repair the open or high resistance in CKT 1850 (BLK) wire between the BCM and ground G200/G201. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

--

12

Locate and repair the open or high resistance in CKT 1140 (ORN) between the underhood fuse block and the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

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13

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 4