Power Seat Does Not Tilt Rearward. GMC Truck Yukon

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2001 🢒 Yukon - 2WD 🢒 Body and Accessories 🢒 Seats 🢒 Power Seat Does Not Tilt Rearward

Power Seat Does Not Tilt Rearward w/oMemory Seats

Step	Action	Yes	No
Schematic Reference: Power Seats Schematics Important: This table assumes that all mechanical linkage and drivers are free from obstruction and not binding. This 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 System. Does the system operate normally?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Disconnect the inoperative rear vertical motor. Connect a test lamp between the rear vertical motor control circuits. Operate the power seat switch to the rear up and rear down positions. Did the test lamp illuminate for each switch position?	Go to Step 6	Go to Step 4
4	Test the control circuits of the inoperative rear vertical motors for a open or a short to ground. Refer to Circuit Testing in Wiring Systems. Did you find and correct the condition?	Go to Step 9	Go to Step 5
5	Inspect the poor connections at the harness connector of the power seat switch. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find and correct the condition?	Go to Step 9	Go to Step 8
6	Inspect the poor connections at the harness connector of the rear vertical motor. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find and correct the condition?	Go to Step 9	Go to Step 7
7	Replace the rear vertical motor. Refer to Front Seat Adjuster Motor Replacement . Did you complete the replacement?	Go to Step 9	--
8	Replace the power seat switch. Refer to Power Seat Switch Replacement in Wiring Systems. Did you compete the replacement?	Go to Step 9	--
9	Operate the system to verify the repair. Did you correct the condition?	System OK	Go to Step 3

Power Seat Does Not Tilt Rearward w/ Memory Seats

Test Descriptions

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

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 .

Step

Action

Value(s)

Yes

Schematic Reference: Memory Seats Schematics Power Seats Schematics

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.

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

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

Does the seat tilt rearward for approximately two seconds and stop in both vertical-up and down directions?

Go to Step 4

Go to Step 7

•	Disconnect the rear vertical motor position sensor harness at the motor.

•	Activate the seat in any direction.

•	Measure the voltage from rear vertical 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

•	Activate the rear vertical power seat switch in both up and down directions.

•	Measure the voltage from the rear vertical seat motor position sensor signal circuit to a good ground.

Does the voltage measured near the specified value?

5 V

Go to Step 6

Go to Step 14

•	Activate the rear vertical power seat switch in both up and down directions.

•	Measure the voltage between the rear vertical motor position sensor voltage reference and the rear vertical motor position sensor low reference.

Does the voltage measured near the specified value?

5 V

Go to Step 18

Go to Step 15

•	Back probe the power seat rear vertical up 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 rear vertical up direction while observing the test lamp.

Did the test lamp illuminate?

Go to Step 8

Go to Step 10

•	Back probe the power seat rear vertical down 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 rear vertical down direction while observing the test lamp.

Did the test lamp illuminate?

Go to Step 9

Go to Step 11

•	Disconnect the rear vertical motor harness connector at the rear vertical motor.

•	Connect a test lamp between the rear vertical motor control circuits.

•	Operate the power seat switch to the up and down direction.

Did the test lamp illuminate for both switch positions?

Go to Step 17

Go to Step 12

Test the power seat rear vertical up switch signal circuit to the memory seat module for open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.