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Test Description

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

  1. 2:  Listen for an audible click when the RUN relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  This step tests for voltage at the coil side of the RUN relay.
  3. 4:  This step verifies that the BCM is providing ground to the RUN relay.
  4. 5:  This step tests the control circuit side of the RUN relay for faults.
  5. 10:  After replacement of the BCM you must calibrate the new module for proper operation.
DTC B1433

Step Action Yes No
Schematic Reference: Body Control System Schematics 
Connector End View Reference:  Master Electrical Component List  in Wiring Systems 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the RUN relay ON and OFF.
Does the RUN relay turn ON and OFF with each command?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Remove the RUN relay.
  3. Turn the engine ON, with the engine OFF.
  4. Test the control circuit at the RUN relay socket for voltage and ground as required by the schematic. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 4 
4 
  1. Connect a test lamp between the RUN relay control circuit of the RUN relay socket and the battery positive voltage circuit of the RUN relay.
  2. With a scan tool, command the RUN relay ON and OFF.
Does the test lamp turn ON and OFF?		 Go to Step 6  Go to Step 5 
5  Test the control circuit of the RUN relay from the body control module (BCM) for the following conditions:
  • A short to ground
  • A short to battery positive voltage
  • An open circuit

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
6 Inspect for poor connections and terminal damage at the RUN 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 11  Go to Step 9 
7 Inspect for poor connections at the harness connector of 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 11  Go to Step 10 
8 Repair the non switched B+ circuit of the RUN relay. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 11  -
9 Replace the RUN relay.
Did you complete the replacement?		 Go to Step 11  -
10  Replace the BCM. Refer to Control Module References  for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 11  -
11
  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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