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Test Description

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. 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 PARK LAMP relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 4:  This step tests for voltage at the coil side of the PARK LAMP relay.
  3. 5:  This step verifies that the BCM is providing ground to the PARK LAMP relay.
DTC B2585

Step Action Yes No
Schematic Reference: Exterior Lights Schematics 
Connector End View Reference: Master Electrical Component List
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the PARK LAMP relay ON and OFF.
Does the PARK LAMP relay turn ON and OFF with each command?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 Is DTC B2585.01 set? Go to Step 6  Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect the PARK LAMP relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the coil side battery positive voltage circuit of the PARK LAMP relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 11 
5 
  1. Connect a test lamp between the control circuit of the PARK LAMP relay and the coil side battery positive voltage circuit of the PARK LAMP relay.
  2. With a scan tool, command the PARK LAMP relay ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 7  Go to Step 8 
6 Test the control circuit of the PARK LAMP relay for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
7 Test for an open or high resistance in the park lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 9 
8 Test for an open, high resistance, or short to voltage in the control circuit of the PARK LAMP relay. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
9 Inspect for poor connection at the PARK LAMP relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 12 
10 Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
11 Repair an open, high resistance, or short to ground in the coil side battery positive voltage circuit of the PARK LAMP relay. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 Go to Step 14  -
12 Replace the PARK LAMP relay.
Did you complete the replacement?		 Go to Step 14  -
13 Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 14  -
14
  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  -
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