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

2: Verifies that the value displayed is within the specified range.
3: Tests for the proper operation of the circuit in the high voltage range.
4: Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.

DTC B0183 or B0188

Step	Action	Value(s)	Yes	No
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views
1	Did you perform the HVAC Diagnostic System Check?	-	Go to Step 2	Go to Diagnostic System Check - HVAC Systems - Automatic
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate Solar Sensor parameter in the Body Control Module data list. Does the scan tool indicate that the appropriate Solar Sensor parameter is within the specified range?	5-250 Counts	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Turn OFF the ignition. Disconnect the sunload sensor assembly. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate Solar Sensor data parameter. Does the scan tool indicate that the appropriate Solar Sensor parameter is greater than the specified value?	250 Counts	Go to Step 4	Go to Step 5
4	Turn OFF the ignition. Connect a 3 amp fused jumper wire between the signal circuit of the sunload sensor assembly and the low reference circuit of the sunload sensor assembly. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate Solar Sensor parameter. Does the scan tool indicate that the appropriate Solar Sensor parameter is less than the specified value?	5 Counts	Go to Step 8	Go to Step 6
5	Test the appropriate solar signal circuit of the sunload sensor assembly for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 9
6	Test the appropriate signal circuit of the sunload sensor assembly for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 7
7	Test the low reference circuit of the sunload sensor assembly for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 9
8	Inspect for poor connections at the harness connector of the sunload sensor assembly. 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
9	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 12	Go to Step 11
10	Replace the sunload sensor assembly. Refer to Sun Load Sensor Replacement . Did you complete the replacement?	-	Go to Step 12	-
11	IMPORTANT: Perform the set up procedure for the BCM. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?	-	Go to Step 12	-
12	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