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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 921 (POWER SEAT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER SEAT DOES NOT RECLINE (W MEMORY SEATS)TEST DESCRIPTIONS
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Test Descriptions

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Test Descriptions
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2001 GMC Yukon XL, 2001 GMC Yukon, 2001 GMC Sierra, 2001 GMC Cab & Chassis Sierra, and 2001 GMC C3500 HD. 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. 4 

    In order to conserve battery power, the memory Seat Module enters a sleep mode when ever the unit has not been active for 16 seconds. To wake the memory seat module again from a sleep mode, the switch must be activated .

  1. 5 

    In order to conserve battery power, the memory Seat Module enters a sleep mode when ever the unit has not been active for 16 seconds. To wake the memory seat module again from a sleep mode, the switch must be activated .

  1. 6 

    In order to conserve battery power, the memory Seat Module enters a sleep mode when ever the unit has not been active for 16 seconds. To wake the memory seat module again from a sleep mode, the switch must be activated .

Power Seat Does Not Recline (W Memory Seats)

Step Action Value(s) Yes No
Schematic Reference:  Memory Seats Schematics  Power Seats Schematics (Pickup) , Power Seats Schematics (Utilities) 
IMPORTANT:

This table assumes that all mechanical linkage and drivers are free from obstruction and not binding. This table also assumes that all other directions are operational.
1 Did you review the power seats system Description and Operation and perform the necessary inspections? - Go to Step 2  Go to Power Seats System Description and Operation 
2 Operate the power seat in all direction.
Does the system operate normally?		 - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 Does the seat recline for approximately two seconds and stop in both forward and rearward directions? - Go to Step 4  Go to Step 7 
4 
  • Disconnect the recline motor position sensor harness at the motor.
  • Activate the seat in any direction.
  • Measure the voltage from recline motor position sensor voltage reference circuit to a good ground.
Does the voltage measured near the specified value?		 5 V Go to Step 5  Go to Step 13 
5 
  • Activate the recline power seat switch in both forward and rearward directions.
  • Measure the voltage from the recline seat motor position sensor signal circuit, at the memory seat module, to a good ground.
Does the voltage measured near the specified value?		 5 V Go to Step 6  Go to Step 14 
6 
  • Activate the recline power seat switch in both forward and rearward directions.
  • Measure the voltage between the recline motor position sensor voltage reference and the recline motor position sensor low reference.
Does the voltage measured near the specified value?		 5 V Go to Step 18  Go to Step 15 
7
  • Back probe the power seat recline forward switch signal at the memory seat module, with a test lamp connected to a good ground.
  • Operate the power seat switch to move the seat in recline forward direction while observing the test lamp.
Did the test lamp illuminate?		 - Go to Step 8  Go to Step 10 
8
  • Back probe the power seat recline rearward switch signal at the memory seat module, with a test lamp connected to a good ground.
  • Operate the power seat switch to move the seat in recline rearward direction while observing the test lamp.
Did the test lamp illuminate?		 - Go to Step 9  Go to Step 11 
9
  • Disconnect the recline motor harness connector at the recline motor.
  • Connect a test lamp between the recline motor control circuits.
  • Operate the power seat switch to the forward and rearward direction.
Did the test lamp illuminate for both switch positions?		 - Go to Step 17  Go to Step 12 
10 Test the power seat recline forward switch signal circuit to the memory seat module for open or short to ground. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 23  Go to Step 16 
11 Test the power seat recline rearward switch signal circuit to the memory seat module for open or short to ground. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 23  Go to Step 16 
12 Test recline motor control circuit(s) between the harness connector and memory seat module for open or short to ground. Refer to Circuit Testing , and Wiring Repairs and in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 23  Go to Step 19 
13 Test recline motor position sensor voltage reference circuit for open or short to ground . Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 23  Go to Step 19 
14 Test recline motor position sensor signal circuit for open, short to ground, or short to battery positive. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 23  Go to Step 19 
15 Test recline motor position sensor low reference circuit for open or short to battery positive. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 23  Go to Step 19 
16 Inspect for poor connections at the harness connector of the power seat switch 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 23  Go to Step 20 
17 Inspect for poor connections at the harness connector of the recline motor control circuits. 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 23  Go to Step 21 
18 Inspect for poor connections at the harness connector of the recline motor position sensor circuits. 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 23  Go to Step 21 
19 Inspect for poor connections at the harness connector of the memory seat module . 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 23  Go to Step 22 
20 Replace the power seat switch assembly. Refer to Power Seat Switch Replacement 
Did you complete the replacement?		 - Go to Step 23  -
21 Replace the recline motor. Refer to Front Seat Adjuster Motor Replacement 
Did you complete the replacement?		 - Go to Step 23  -
22 Replace the memory seat module. Refer to Memory Seat Control Module Replacement .
Did you complete the replacement?		 - Go to Step 23  -
23 Operate the system to verify the repair.
Did you correct the condition?		 - System OK Go to Step 3 
RENDER: 1.0x

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