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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Listen for an audible click when the IGN 1 relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  Verifies that the BCM is providing voltage to the IGN 1 relay.
  3. 4:  Tests for an open in the ground circuit to the IGN 1 relay.
  4. 5:  Tests if voltage is constantly being applied to the IGN 1 relay.
DTC B1428

Step Action Yes No
Schematic Reference: Body Control System Schematics  in Body Control Systems and Engine Controls Schematics in Engine Controls 3.8L (L26 and L32)
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check for the system exhibiting the symptom? Go to Step 2  Go to Control Module References 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the Ignition Power Relay (IGN 1 Relay) ON and OFF.
Does the IGN 1 relay turn ON and OFF with each command?		 Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the IGN 1 relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the control circuit of the IGN 1 relay with a test lamp connected to a good ground.
  5. With a scan tool, command the IGN 1 relay ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 4  Go to Step 5 
4 
  1. Connect a test lamp between the control circuit of the IGN 1 relay and the ground circuit of the IGN 1 relay.
  2. With a scan tool, command the IGN 1 relay ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 9  Go to Step 8 
5  Does the test lamp remain illuminated with each command? Go to Step 6  Go to Step 7 
6 Test the control circuit of the IGN 1 relay for a short to B+. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 10 
7
  1. Turn the Ignition OFF.
  2. Remove the harness connector from the BCM that contains the IGN 1 relay control circuit.
  3. Test the control circuit of the IGN 1 relay for an open between the relay socket and the BCM harness connector.

    Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?		 Go to Step 13  Go to Step 10 
8
  1. Turn the Ignition OFF.
  2. Test the Ground of the IGN 1 relay control circuit for an open, between the relay socket and a good ground.

    Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?		 Go to Step 13  Go to Step 9 
9 Inspect for poor connections at the IGN 1 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 11 
10 Inspect for poor connections at the console electrical center connector to the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 12 
11 Replace the IGN 1 relay.
Did you complete the replacement?		 Go to Step 13  -
12
  1. Replace the BCM. Refer to Body Control Module Replacement  in Body Control System.
  2. Perform the set up procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration  in Body Control System.
Did you complete the replacement?		 Go to Step 13  -
13
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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