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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Seat Heating And Cooling) >> Diagnostic Information and Procedures >> DTC B2435 or B2440 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. 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. 3:  Tests for the proper operation of the circuit in the high voltage range.
  2. 4:  Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens upon performing this test, the signal circuit has a short to voltage.
DTC B2435 or B2440

Step Action Values Yes No
Schematic Reference: Driver Seat Schematics , Passenger Seat Schematics
Connector End View Reference: Power Seat Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Start the engine.
  3. Turn the heated seat ON.
  4. With a scan tool, observe the Heated Seat Sensor parameter in the Driver Seat Module Data List.
Does the scan tool indicate that the Heated Seat Sensor parameter is within the specified range?		 0.078-4.94 V Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the heated seat back 4-way connector.
  3. Start the engine.
  4. Turn the heated seat ON.
  5. With a scan tool, observe the Heated Seat Sensor parameter.
Is the Heated Seat Sensor parameter greater than the specified value?		 4.5 V Go to Step 4  Go to Step 5 
4 
  1. Turn OFF the ignition.
  2. Connect a 3-amp fused jumper wire between the signal circuit of the heated seat sensor and the low reference circuit of the heated seat sensor.
  3. Start the engine.
  4. Turn the heated seat ON.
  5. With a scan tool, observe the Heated Seat Sensor parameter.
Is the Heated Seat Sensor parameter less than the specified value?		 0.5 V Go to Step 8  Go to Step 6 
5 Test the signal circuit of the heated seat sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
6 Test the signal circuit of the heated seat sensor for one of the following conditions:
  • A short to voltage
  • A high resistance
  • An open

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 7 
7 Test the low reference circuit of the heated seat sensor for one of the following conditions:
  • A high resistance
  • An open

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
8 Inspect for poor connections at the harness connector of the heated seat sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 10 
9 Inspect for poor connections at the harness connectors of the driver seat module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the seat back heater element.
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the driver seat module. Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 - Go to Step 12  -
12
  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 2  System OK
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