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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 983 (Seat System) >> Diagnostic Information and Procedures >> DTC B2435 or B2440: Seat Back Heater Sensor Circuit >> Test Description

Test Description

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.

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 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
  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 data list for the driver seat module (DSM).
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 in Wiring Systems 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-ampere 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 in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 DSM. 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 12  Go to Step 11 
10 Replace the seat back heater element. Refer to Seat Back Heater Element Replacement - Front .
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the DSM. Refer to Memory Seat Control Module Replacement .
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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