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DTC C0293

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC C0293 01: Hand brake Switch Control Short to Battery

DTC C0293 06: Hand brake Switch Control Low Voltage/Open

DTC C0293 08: Hand brake Switch Control Performance-Signal Invalid

Circuit/System Description

The hand brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The hand brake control module also contains the logic for applying and releasing the hand brake when commanded by the hand brake control switch. The hand brake control module will perform diagnostics on the hand brake control switch and its wiring harness to verify it is functioning properly. When the hand brake control module receives a signal from the switch the internal circuit board temperature is checked to verify it is within operating range before the control module performs the requested operation.

The hand brake control switch diagnostic checks for failure conditions in the hand brake switch and associated wiring into the hand brake control module.

Conditions for Running the DTC

Vehicle OFF, Vehicle in Service Mode, Vehicle ON, or Engine Running.

Conditions for Setting the DTC

The hand brake control module detects a short to battery, short to ground, open circuit, or an internal hand brake switch control malfunction.

Action Taken When the DTC Sets
    • The electric hand brake is disabled.
    • A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC
    • The hand brake control module clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
    • The condition for the DTC is no longer present.

Reference Information

Schematic Reference

Hand brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Hand brake Control Module Description

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Test

C0293 01 or C0293 06

  1. Vehicle OFF, disconnect the harness at the S91 Electric Hand Brake Switch.
  2. Verify that a test lamp illuminates between the B+ circuit terminal listed below and ground:
    3. • Terminal 4
    • Terminal 5
    ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K83 Electric Hand brake Control Module.
  3. Reconnect the harness at the S91 Electric Hand brake Switch. Disconnect the harness at the K83 Electric Hand brake Control Module.
  4. Test for less than 1 V between the circuit terminal listed below and ground:
    5. • Terminal R
    • Terminal S
    ⇒If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the S91 Electric Hand Brake Switch.
  5. Vehicle in Service Mode, test for less than 1 V between the following signal circuit terminals at the electric hand brake switch harness connector and ground:
    6. • Terminal 2
    • Terminal 3
    • Terminal 7
    ⇒If greater than the specified range, test the signal circuit for a short to voltage.
  6. Test for infinite resistance between the signal circuits listed below and ground:
    7. • Terminal 2
    • Terminal 3
    • Terminal 7
    ⇒If less than the specified value, test the signal circuit for a short to ground.
  7. Test for less than 5 Ω between the following signal circuit terminals:
    8. • Electric hand brake switch harness terminal 1 and the electric hand brake control module terminal N
    • Electric hand brake switch harness terminal 2 and the electric hand brake control module terminal C
    • Electric hand brake switch harness terminal 3 and the electric hand brake control module terminal B
    • Electric hand brake switch harness terminal 7 and the electric hand brake control module terminal D
    ⇒If greater than the specified range, test the signal circuit for an open/high resistance.
  8. If all circuits test normal, test or replace the S91 Electric Hand brake Switch. If DTC resets, replace the K83 Electric Hand brake Control Module.

C0293 08

Remove the electric hand brake fuse and reinstall. Verify DTC C0293 08 is not set.

⇒If DTC C0293 08 is set, replace the S91 Electric Hand brake Switch.

Component Testing
  1. Vehicle OFF, disconnect the harness connector at the hand brake control switch.
  2. Test for infinite resistance between the terminals listed below with the switch in the inactive state:
    3. • B+ terminal 4 and the hand brake control switch signal terminal 1
    • B+ terminal 4 and the hand brake control switch signal terminal 2
    • B+ terminal 5 and the hand brake control switch signal terminal 1
    • B+ terminal 5 and the hand brake control switch signal terminal 2
    • Hand brake control switch signal terminal 3 and the hand brake control switch signal terminal 1
    • Hand brake control switch signal terminal 3 and the hand brake control switch signal terminal 2
    • Hand brake control switch signal terminal 7 and the hand brake control switch signal terminal 1
    • Hand brake control switch signal terminal 7 and the hand brake control switch signal terminal 2
    ⇒If less than the specified range, replace the S91 hand brake control switch.
  3. Test for less than 5 Ω between the terminals listed below with the switch in the inactive state:
    4. • Hand brake control switch signal terminal 1 and terminal 2
    • B+ terminal 4 and hand brake control switch signal terminal 7
    • B+ terminal 5 and hand brake control switch signal terminal 3
    ⇒If greater than the specified range, replace the S91 hand brake control switch.
  4. Test for less than 5 Ω between the terminals listed below with the switch in the apply position:
    5. • Hand brake switch signal terminal 1 and terminal 2
    • B+ terminal 4 and hand brake switch signal terminal 1
    • B+ terminal 4 and hand brake switch signal terminal 2
    • B+ terminal 5 and hand brake switch signal terminal 3
    ⇒If greater than the specified range, replace the S91 hand brake control switch.
  5. Test for less than 5 Ω between the terminals listed below with the switch in the apply position:
    6. • Hand brake control switch signal terminal 1 and terminal 2
    • B+ terminal 5 and hand brake control switch signal terminal 1
    • B+ terminal 5 and hand brake control switch signal terminal 2
    • B+ terminal 4 and hand brake control switch signal terminal 7
    ⇒If greater than the specified range, replace the S91 hand brake control switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Hand brake Switch Replacement
    • Control Module References for hand brake module replacement, programming and setup
   


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