GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 TrailBlazer - 2WD 🢒 Accessories 🢒 Adjustable Pedals 🢒 DTC B3606

Circuit Description

The driver seat module monitors the location of the adjustable pedals using the brake pedal position sensor. The brake pedal position sensor is supplied with 5-volt reference and ground circuits from the driver seat module. The position sensor signal circuit is referenced from ground within the driver seat module. The signal voltage monitored by the driver seat module ranges from 0.39-4.58 volts and is determined by the wiper location on the resistor within the position sensor. The position sensor circuit voltage level is used by the driver seat module to determine the position of the adjustable pedals when storing or recalling memory position settings.

Conditions for Running the DTC

Battery voltage to the seat module must be within 7-16 volts.

Conditions for Setting the DTC

The position sensor signal circuit voltage level to the driver seat module is not within the 0.39-4.58 volt range.

Action Taken When the DTC Sets

The memory recall functions will be disabled for as long as the DTC is current.

Conditions for Clearing the DTC
    • The DTC will be stored as a history code when the fault is no longer present.
    • A history DTC will be cleared after completing 100 consecutive ignition cycles, or by using the scan tool clearing DTCs feature.

Diagnostic Aids

If the DTC is only found in history, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

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

  1. Tests for the proper operation of the circuit in the low voltage range.

    2.

  2. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens if you perform this test, the signal circuit is short to ground.

    3.

  3. Tests for a short to voltage in the 5-volt reference circuit.

Step

Action

Values

Yes

No

Schematic Reference: Adjustable Pedal Schematics

Connector End View Reference: Adjustable Pedal Connector End Views

1

Did you perform the Adjustable Pedal Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Adjustable Pedals

2
  1. Install a scan tool.
  2. With a scan tool, observe the brake pedal position sensor parameter in the seat module Adjustable Pedal data list.

Is the position sensor parameter within the specified range?

0.39-4.58 V

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the position sensor connector.
  2. With a scan tool, observe the position sensor parameter.

Is the position sensor parameter less than the specified value?

0.39 V

Go to Step 4

Go to Step 8

4

  1. Connect a 3-amp fused jumper wire between the 5-volt reference circuit terminal and the signal circuit terminal in the position sensor harness connector.
  2. With a scan tool, observe the position sensor parameter.

Is the position sensor parameter greater than the specified value?

4.58 V

Go to Step 5

Go to Step 7

5

  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 5-volt reference circuit terminal and the low reference circuit terminal in the position sensor harness connector.

Is the voltage measure greater than the specified value?

5.0 V

Go to Step 6

Go to Step 10

6

Test the 5-volt reference circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 12

7

Test the 5-volt reference circuit for one of the following conditions:

    • A short to ground
    • A high resistance
    • An open

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 9

8

Test the signal circuit of the position sensor for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 12

9

Test the signal circuit of the position sensor for one of the following conditions:

    • A short to ground
    • A high resistance
    • An open

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 12

10

Test the low reference circuit of the position sensor for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 11

11

Inspect for poor connections at the brake pedal position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 13

12

Inspect for poor connections at the driver seat module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 14

13

Replace the brake pedal position sensor. Refer to Brake Pedal Position Sensor Replacement .

Did you complete the replacement?

--

Go to Step 15

--

14

Replace the driver seat module. Refer to Memory Seat Control Module Replacement in Seats.

Did you complete the replacement?

--

Go to Step 15

--

15
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK