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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 647 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B1770, B1775, B1780, B1785, B1790, B1805, or B2415 >> Test Description

Test Description

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

  1. 3:  This step determines if the DTC is set as the result of an adjuster motor fault or a position sensor fault.
  2. 6:  During this test the memory seat module must see an active switch input before power will be supplied the position sensor.
  3. 7:  During this test the memory seat module must see an active switch input before power will be supplied the position sensor.
  4. 8:  During this test the memory seat module must see an active switch input before power will be supplied the position sensor.
DTC B1770, B1775, B1780, B1785, B1790, B1805, or B2415

Step Action Yes No
Schematic Reference:  Power Seats Schematics  
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 AND POOR CONNECTIONS Go to Step 3 
3  Attempt to operate the power seat function for which the DTC has set.
Is the seat adjuster motor for which the DTC has set inoperative?		 Go to Step 4  Go to Step 6 
4
  1. Disconnect the appropriate seat adjuster motor connector.
  2. Connect a test lamp across the adjuster motor control circuit terminals in the harness connector.
  3. Operate the appropriate seat adjuster switch in both directions.
Does the test lamp illuminate when the switch is activated and turn off when the switch is released?		 Go to Step 12  Go to Step 5 
5 Test the adjuster motor control circuits for the following conditions:
  • Short to ground
  • Open or high resistance
  • Short to voltage

Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 16  Go to Step 13 
6 
  1. Disconnect the position sensor connector to the motor for which the DTC has set.
  2. Connect a DMM from the 5-volt 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 5 volts when the adjuster switch is pressed?		 Go to Step 7  Go to Step 9 
7 
  1. Connect a DMM from the 5-volt 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 5 volts when the adjuster switch is pressed?		 Go to Step 8  Go to Step 10 
8 
  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 5 volts when the adjuster switch is pressed?		 Go to Step 12  Go to Step 11 
9 Test the position sensor 5-volt reference circuit for the following conditions:
  • Open
  • Short to ground
  • Short to voltage

Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 16  Go to Step 13 
10 Test the position sensor low reference circuit for an open or short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 16  Go to Step 13 
11 Test the position sensor signal circuit for the following conditions:
  • Open
  • Short to ground
  • Short to voltage

Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 16  Go to Step 13 
12 Inspect for poor connections at the adjuster motor connector. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS .
Did you find and correct the condition?		 Go to Step 16  Go to Step 14 
13 Inspect for poor connections at the harness connector of the memory seat module. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS .
Did you find and correct the condition?		 Go to Step 16  Go to Step 15 
14 Replace the appropriate adjuster motor assembly. Refer to Seat Adjuster Motor Replacement - Front .
Did you complete the replacement?		 Go to Step 16  -
15 Replace the memory seat module. Refer to Memory Seat Control Module Replacement .
Did you complete the replacement?		 Go to Step 16  -
16
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the system in order to verify the repair.
Does the DTC reset?		 Go to Step 3  System OK
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