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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Diagnostic Information & Procedures >> DTC B1850, B1860, B1960, B2355, B2365, OR B2375: Position Sensor Movement Not Detected During Adjuster Motor Operation >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table. See DTC B1850, B1860, B1960, B2355, B2365, Or B2375 .

  1. 3:  During this test the driver seat module must see an active switch input before power will be supplied the position sensor.
  2. 4:  During this test the driver seat module must see an active switch input before power will be supplied the position sensor.
  3. 5:  During this test the driver seat module 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:  Memory Seats Schematics  ,  Lumbar Support 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 fault is present.
Does the system operate normally?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Disconnect the position sensor connector to the motor for which the DTC has set.
  2. Connect a DMM from the positive voltage reference circuit terminal in the position sensor harness connector to a good ground.
  3. 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 
  1. Connect a DMM from the positive voltage reference circuit terminal to the low reference circuit terminal in the position sensor harness connector.
  2. 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 
  1. Connect a DMM from the signal circuit terminal to the low reference circuit terminal in the position sensor harness connector.
  2. 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:
  • Open
  • Short to ground
  • Short to voltage

Refer to Circuit Testing and to 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 to 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:
  • Open
  • Short to ground
  • Short to voltage

Refer to Circuit Testing and to 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 to 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. Refer to Testing for Intermittent Conditions and Poor Connections and to 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 driver seat module. Refer to Memory Seat Control Module Replacement .
Did you complete the replacement?		 Go to Step 13  -
13
  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 3  System OK
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