GM Service Manual Online
For 1990-2009 cars only

Object Number: 502373  Size: MF
Body Control Module Components
Cell 51: Body Control Module (PZM) Power and Ground (2 of 2)
Power Distribution Schematics
Body Control System Connector End Views
Handling ESD Sensitive Parts Notice
Power Distribution Schematics

Circuit Description

The inadvertent power relay is controlled by the body control module (PZM). The PZM grounds the inadvertent power relay through connector C2 terminal C3.

Conditions for Setting the DTC

The inadvertent power relay is commanded ON or OFF and the PZM feed back does not match that of the commanded state for at least 2 seconds.

Action Taken When the DTC Sets

The PZM continues to command the requested state of the relay until the state is achieved or no longer necessary.

Conditions for Clearing the DTC

    • The PZM feedback matches that of the commanded state for at least 2 seconds.
    • A history DTC clears after 50 consecutive ignition cycles if the condition is no longer present.

Step

Action

Value(s)

Yes

No

1

Was the Body Control Module Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - Body Control System

2

  1. Turn OFF the ignition switch.
  2. Connect a Scan Tool to the vehicle.
  3. Command the inadvertent power ON with the scan tool.
  4. Turn the interior lamps ON.

Do the lamps turn ON?

--

Go to Step 3

Go to Step 4

3

  1. Disconnect the inadvertent power relay.
  2. Disconnect the PZM.
  3. Test CKT 247 (BRN) for a short to ground.

Is CKT 247 (BRN) shorted?

--

Go to Step 5

Go to Step 6

4

  1. Disconnect the inadvertent power relay.
  2. Measure the voltage from the inadvertent power relay terminal A1 to ground.

Is battery positive (B+) voltage present?

--

Go to Step 7

Go to Step 8

5

Repair the short to ground in CKT 247 (BRN).

Is the repair complete?

--

Go to Diagnostic System Check - Body Control System

--

6

Replace the PZM. Refer to Body Control Module Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Body Control System

--

7

  1. Turn the inadvertent power ON using the Scan Tool .
  2. Measure the resistance from the inadvertent power relay terminal C2 to ground.

Is the resistance less the specified value?

5 ohms

Go to Step 9

Go to Step 10

8

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

Is the repair complete?

--

Go to Diagnostic System Check - Body Control System

--

9

Replace the inadvertent power relay.

Is the repair complete?

--

Go to Diagnostic System Check - Body Control System

--

10

Inspect CKT 247 (BRN) for an open.

Is CKT 247 open?

--

Go to Step 11

Go to Step 6

11

Repair the open in CKT 247 (BRN).

Is the repair complete?

--

Go to Diagnostic System Check - Body Control System

--