GM Service Manual Online
For 1990-2009 cars only

Circuit Description

When the body control module (PZM) receives a serial data message that the transaxle is in park, the PZM grounds CKT 434 (ORN/BLK) enabling the PARK relay. The PZM monitors this output and determines the actual voltage.

Conditions for Setting the DTC

The PZM determines that the voltage at connector C2 terminal C15 is approximately equal to ground.

Action Taken When the DTC Sets

The PZM continues to command the requested state until the state is achieved or until the request changes.

Conditions for Clearing the DTC

The PZM determines that the voltage at connector C2 terminal C15 is greater than ground for one monitoring cycle.

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. Disconnect the PZM.
  2. Disconnect the PARK relay.
  3. Measure the resistance from the PZM connector C2 terminal C15 to ground.

Is the resistance within the specified range?

0-5 ohms

Go to Step 3

Go to Step 4

3

Repair the short to ground in CKT 434 (ORN/BLK).

Is the repair complete?

--

Go to Diagnostic System Check - Body Control System

--

4

Replace the PZM. Refer to Body Control Module Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Body Control System

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