Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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.

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

DTC B2815

Step	Action	Value(s)	Yes	No
Schematic Reference: Radio/Audio System Schematics (Base/Uplevel Radio - UQ3/UQ5) Radio/Audio System Schematics (Premium Radio - UQ7 w/o Y91) Radio/Audio System Schematics (Luxury Radio - UQ7 w/Y91) Connector End View Reference: Entertainment Connector End Views
1	Did you perform the Diagnostic System Check - Entertainment System?	-	Go to Step 2	Go to Diagnostic System Check - Entertainment System
2	Install a scan tool. Turn ON the ignition, with the engine OFF. 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 V	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	CAUTION: Refer to SIR Caution in Cautions and Notices. Disable the SIR system. Refer to SIR Disabling and Enabling Zone 1 and SIR Disabling and Enabling Zone 3 in SIR. Turn OFF the ignition. Disconnect the left steering wheel controls. Turn ON the ignition, with the engine OFF. 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 V	Go to Step 6	Go to Step 4
4	Turn OFF the ignition. Disconnect the right steering wheel controls. Turn ON the ignition, with the engine OFF. 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 V	Go to Step 7	Go to Step 5
5	Test the remote radio control signal circuit 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 Replacement 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 Replacement 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 in Body Control System.Did you complete the replacement?	-	Go to Step 12	-
12	Enable the SIR system. Refer to SIR Disabling and Enabling Zone 1 and SIR Disabling and Enabling Zone 3 in SIR. Use the scan tool in order to clear the DTCs. 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