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.

3: During this test the DSM must see an active switch input before power will be supplied the position sensor.
4: During this test the DSM must see an active switch input before power will be supplied the position sensor.
5: During this test the DSM must see an active switch input before power will be supplied the position sensor.

DTC B1850, B1860, B1960, B2355, B2365, or B2375

Step	Action	Yes	No
Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views
1	Did you perform the Power Seat Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Power Seat Systems
2	Verify the condition is present. Does the system operate normally?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Disconnect the position sensor connector to the motor for which the DTC has set. Connect a DMM from the positive voltage reference circuit terminal in the position sensor harness connector to a good ground. Press the adjuster switch in either direction. Does the DMM display battery voltage when the adjuster switch is pressed?	Go to Step 4	Go to Step 6
4	Connect a DMM from the positive voltage reference circuit terminal to the low reference circuit terminal in the position sensor harness connector. Press the adjuster switch in either direction. Does the DMM display battery voltage when the adjuster switch is pressed?	Go to Step 5	Go to Step 7
5	Connect a DMM from the signal circuit terminal to the low reference circuit terminal in the position sensor harness connector. Press the adjuster switch in either direction. Does the DMM display battery voltage when the adjuster switch is pressed?	Go to Step 9	Go to Step 8
6	Test the position sensor positive voltage reference circuit for the following conditions: An open A short to ground A short to voltage Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 13	Go to Step 10
7	Test the position sensor low reference circuit for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 13	Go to Step 10
8	Test the position sensor signal circuit for the following conditions: An open A short to ground A short to voltage Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 13	Go to Step 10
9	Inspect for poor connections at the adjuster motor connector. 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 13	Go to Step 11
10	Inspect for poor connections at the harness connector of the driver seat module (DSM). 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 13	Go to Step 12
11	Replace the appropriate adjuster motor assembly. Refer to Seat Adjuster Motor Replacement - Front or Lumbar Replacement - Front Seat . Did you complete the replacement?	Go to Step 13	-
12	Replace the DSM. Refer to Memory Seat Control Module Replacement . Did you complete the replacement?	Go to Step 13	-
13	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset?	Go to Step 3	System OK