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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.

  1. 3:  Tests for the proper operation of the signal circuit in the low voltage range.
  2. 4:  Tests for the proper operation of the signal circuit in the high voltage range.
  3. 5:  Tests for a short to voltage in the 5-volt reference circuit.
DTC B1825

Step Action Values Yes No
Schematic Reference: Driver Seat Schematics 
Connector End View Reference: Power Seat Systems Connector End Views 
1 Did you perform the Power Seat Systems Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Power Seat Systems 
2
  1. Install a scan tool.
  2. With a scan tool, observe the Recline Position Sensor parameter in the driver seat module (DSM) Sensor Data list.
Is the Recline Position Sensor parameter within the specified range?		 0.39-4.58 V Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Disconnect the recline motor position sensor.
  2. With a scan tool, observe the Recline Position Sensor parameter.
Is the Recline Position Sensor parameter less than the specified value?		 0.39 V Go to Step 4  Go to Step 8 
4 
  1. Connect a 3-ampere fused jumper wire between the signal circuit of the recline position sensor and the 5-volt reference circuit of the recline position sensor.
  2. With a scan tool, observe the Recline Position Sensor parameter.
Is the Recline Position Sensor parameter greater than the specified value?		 4.58 V Go to Step 5  Go to Step 7 
5 
  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 5-volt reference and the signal circuit of the recline position sensor.
Is the voltage greater than the specified value?		 5 V Go to Step 6  Go to Step 10 
6 Test the 5-volt reference circuit of the recline position sensor 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 15  Go to Step 12 
7 Test the 5-volt reference circuit of the recline position sensor for one of the following conditions:
  • A short to ground
  • A high resistance
  • An open

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 9 
8 Test the signal circuit of the recline position sensor 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 15  Go to Step 12 
9 Test the signal circuit of the recline position sensor for one of the following conditions:
  • A short to ground
  • A high resistance
  • An open

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
10 Test the low reference circuit of the recline position sensor for one of the following conditions:
  • A high resistance
  • An open

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 11 
11 Inspect for poor connections at the harness connector of the recline position sensor. 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 15  Go to Step 13 
12 Inspect for poor connections at the harness connector of the 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 15  Go to Step 14 
13 Replace the recline position sensor.
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the DSM. Refer to Memory Seat Control Module Replacement .
Did you complete the replacement?		 - Go to Step 15  -
15
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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