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Lumbar Support Inoperative (with Memory)

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.
Lumbar Support Inoperative (With Memory)

Step Action Yes No
Schematic Reference: Driver Seat 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 condition 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. Install a scan tool.
  2. Observe the Lumbar and Torso Switch parameters in the driver seat module (DSM) Input/Output data list.
Do any of the Lumbar or Torso Switch parameters display Active?		 Go to Step 4  Go to Step 5 
4 Disconnect the lumbar adjuster switch connector.
Do all of the Lumbar or Torso Switch parameters display Inactive?		 Go to Step 18  Go to Step 13 
5
  1. Observe the Lumbar Forward Switch parameter in the DSM Input/Output data list.
  2. Operate the lumbar forward switch.
Does the scan tool display the lumbar forward switch as active?		 Go to Step 6  Go to Step 9 
6
  1. Observe the Lumbar Rearward Switch parameter in the DSM Input/Output data list.
  2. Operate the lumbar rearward switch.
Does the scan tool display the lumbar rearward switch as active?		 Go to Step 7  Go to Step 10 
7
  1. Observe the Torso Inward Switch parameter in the DSM Input/Output data list.
  2. Operate the torso inward switch.
Does the scan tool display the torso inward switch as active?		 Go to Step 8  Go to Step 11 
8
  1. Observe the Torso Outward Switch parameter in the DSM Input/Output data list.
  2. Operate the torso outward switch.
Does the scan tool display the torso outward switch as active?		 Go to Step 19  Go to Step 12 
9
  1. Disconnect the lumbar switch connector.
  2. Connect a fused jumper wire from the battery voltage supply circuit terminal to the lumbar forward switch signal circuit terminal in the harness connector.
Does the scan tool display the lumbar forward switch as Active?		 Go to Step 18  Go to Step 14 
10
  1. Disconnect the lumbar switch connector.
  2. Connect a fused jumper wire from the battery voltage supply circuit terminal to the lumbar rearward switch signal circuit terminal in the harness connector.
Does the scan tool display the lumbar rearward switch as Active?		 Go to Step 18  Go to Step 15 
11
  1. Disconnect the lumbar switch connector.
  2. Connect a fused jumper wire from the battery voltage supply circuit terminal to the torso inward switch signal circuit terminal in the harness connector.
Does the scan tool display the torso inward switch as Active?		 Go to Step 18  Go to Step 16 
12
  1. Disconnect the lumbar switch connector.
  2. Connect a fused jumper wire from the battery voltage supply circuit terminal to the torso outward switch signal circuit terminal in the harness connector.
Does the scan tool display the torso outward switch as Active?		 Go to Step 18  Go to Step 17 
13 Test the active lumbar or torso switch signal circuit 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 22  Go to Step 19 
14 Test the lumbar forward switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 22  Go to Step 19 
15 Test the lumbar rearward switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 22  Go to Step 19 
16 Test the torso inward switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 22  Go to Step 19 
17 Test the torso outward switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 22  Go to Step 19 
18 Inspect for poor connections at the harness connector of the lumbar 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 22  Go to Step 20 
19 Inspect for poor connections at the harness connector of the DSM. Refer toTesting for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 22  Go to Step 21 
20 Replace the lumbar switch assembly. Refer to Lumbar Switch Replacement .
Did you complete the replacement?		 Go to Step 22  -
21 Replace the DSM. Refer to Memory Seat Control Module Replacement .
Did you complete the replacement?		 Go to Step 22  -
22 Operate the system to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
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