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Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 3:  Tests for the proper operation of the circuit in the low voltage range.
DTC B2815

Step Action Value(s) Yes No
Schematic Reference:  HVAC Schematics  
1 Did you perform the HVAC Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - HVAC Systems - Automatic 
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the SWC Switch Voltage parameter in the Body Control Module data list.
Does the scan tool indicate that the SWC Switch Voltage parameter is near the specified value?		 0 Volts Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems Go to Step 3 
3 
CAUTION: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to DISABLING & ACTIVATING AIR BAG SYSTEM . Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.
  1. Disable the SIR system. Refer to DISABLING & ACTIVATING AIR BAG SYSTEM .
  2. Turn OFF the ignition.
  3. Disconnect the left steering wheel controls.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the SWC Switch Voltage parameter.
Does the scan tool indicate that the SWC Switch Voltage parameter is near the specified value?		 0 Volts Go to Step 6  Go to Step 4 
5
  1. Turn OFF the ignition.
  2. Disconnect the right steering wheel controls.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the SWC Switch Voltage parameter.
Does the scan tool indicate that the SWC Switch Voltage parameter is near the specified value?		 0 Volts Go to Step 7  Go to Step 5 
6 Test the signal circuit of the steering wheel controls for a short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 8 
6 Inspect for poor connections at the harness connector of the left steering wheel control switch. 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 12  Go to Step 9 
7 Inspect for poor connections at the harness connector of the right steering wheel control switch. 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 12  Go to Step 10 
8 Inspect for poor connections at the harness connector of the body control module. 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 12  Go to Step 11 
9 Replace the left steering wheel control switch. Refer to STEERING WHEEL CONTROL SWITCH ASSEMBLY in Steering Wheel and Column.
Did you complete the replacement?		 - Go to Step 12  -
10 Replace the right steering wheel control switch. Refer to STEERING WHEEL CONTROL SWITCH ASSEMBLY in Steering Wheel and Column.
Did you complete the replacement?		 - Go to Step 12  -
11
IMPORTANT: Perform the set up procedure for the body control module.
Replace the body control module. Refer to BODY CONTROL MODULE REPLACEMENT .Did you complete the replacement?		 - Go to Step 12  -
12
  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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