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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Chassis Diagnostic Procedures - Anti-Lock Brake System) >> Diagnostic Information And Procedures >> Brakes (Cab) - Symptoms >> Symptom: BRAKE SWITCH CIRCUIT - 81 >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. VERIFY THE CONCERN
  2. CAB BRAKE STATUS
  3. BRAKE SWITCH OPEN
  4. BRAKE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
  5. BRAKE SWITCH SENSE CIRCUIT OPEN
  6. BRAKE SWITCH GROUND CIRCUIT OPEN
  7. CAB - INTERNAL CONCERN
TEST ACTION AND APPLICABILITY

TEST ACTION APPLICABILITY
1
NOTE: IF DRIVER "RIDES" THE BRAKES, A BRAKE CIRCUIT DIAGNOSTIC CODE MAYBE SET.
Turn the ignition off.Ensure all accessories are turned off and the battery is fully charged.Turn the ignition on.With the DRBIII®, erase DTCs.
CAUTION: Ensure braking capability is available before road testing.
Road test the vehicle for at least 5 minutes over 40 MPH. Perform several antilock braking stops.Monitor the Input/Output status of the brake switch while driving.With the DRBIII®, read DTCs.Does the original DTC recur and/or intermittent brake switch operation occur?
  1. Yes --> Go To 2
  2. No --> Brake Switch circuit is operating correctly at this time. Check for operator error. Inspect for intermittent condition using the wiring diagram/schematic as a guide, inspect the wiring and connectors for damage.

    Perform ABS VERIFICATION TEST - VER 1.

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2 Turn ignition on.
With the DRBIII® in Inputs/Outputs, read the Brake Switch status.
Press and release the brake pedal.
Does the Brake Switch status match that of the Brake Switch?
  1. Yes --> Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for damage.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Go To 3
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3 Disconnect the Brake Lamp Switch harness connector.
With the DRBIII® in Inputs/Outputs, read the Brake Switch state.
Connect and disconnect a jumper wire between the Brake Switch Ground and Sense circuits.
Does the DRBIII® display OPEN and CLOSED (jumper connected)?
  1. Yes --> Replace the Brake Lamp Switch in accordance with the Service Information.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Go To 4
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4 Turn the ignition off.
Disconnect the CAB harness connector.
Disconnect the Brake Lamp Switch harness connector.
Measure the voltage of the Brake Switch Sense circuit.
Is there any voltage present?
  1. Yes --> Repair the Brake Switch Sense circuit for a short to voltage.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Go To 5
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5 Turn the ignition off.
Disconnect the CAB harness connector.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance of the Brake Switch Sense circuit between the CAB connector and the Brake Lamp Switch connector.
Is the Brake Switch Sense circuit open?
  1. Yes --> Repair the Brake Switch Sense circuit for an open circuit.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Go To 6
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6 Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance of the Ground circuit.
Is the resistance below 5.0 ohms?
  1. Yes --> Replace the Controller Antilock Brake in accordance with the Service Information. Refer to the SYMPTOM: *REPLACING THE CONTROLLER ANTILOCK BRAKE  for additional information.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Repair the Brake Switch Ground circuit for an open circuit.

    Perform ABS VERIFICATION TEST - VER 1.

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