DTC C0293
Diagnostic Instructions
DTC Descriptors
DTC C0293 01: Park Brake Switch Control Short
to Battery |
DTC C0293 06: Park Brake Switch Control Low
Voltage/Open |
DTC C0293 08: Park Brake Switch Control
Performance-Signal Invalid |
Circuit/System Description
The electric parking brake control module has an internal motor,
apply actuator, release actuator, and temperature sensor. The
electric parking brake control module also contains the logic for
applying and releasing the parking brake when commanded by the
electric parking brake switch. The electric parking brake module
will perform diagnostics on the electric parking brake switch and
its wiring harness to verify it is functioning properly. When the
electric parking 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 electric park brake switch control diagnostic checks for
failure conditions in the electric park brake switch and associated
wiring into the electric park brake module.
Conditions for Running the DTC
Ignition OFF, ACCESSORY, or RUN mode.
Conditions for Setting the DTC
The electric parking brake control module detects a short to
battery, short to ground, open circuit, or an internal parking
brake switch control malfunction.
Action Taken When the DTC Sets
• |
The electric parking brake is
disabled. |
• |
A message and/or a warning
indicator may be displayed. |
Conditions for Clearing the DTC
• |
The electric parking brake
control module clears the history DTC when a current DTC is not
detected in 40 ignition cycles. |
• |
The condition for the DTC is
no longer present. |
Reference Information
Schematic Reference
Park Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Electronic Parking Brake Control Module Description
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Test
C0293 01 or C0293 06
1. |
Ignition OFF, disconnect the
harness at the S91 Electric Parking Brake Switch. |
2. |
Test for B+ between the B+
circuit terminal listed below and ground: |
⇒ |
If less than the specified range, test the B+
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the K83 Electric Parking Brake
Control Module. |
⇒ |
If greater than the specified range, test the B+
circuit for a short to voltage. If the circuit tests normal,
replace the K83 Electric Parking Brake Control Module. |
3. |
Disconnect the harness at the
K83 Electric Parking Brake Control Module. |
4. |
Ignition ON, test for less
than 1 V between the following signal circuit terminals at the
electric parking brake switch harness connector and ground:
|
⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage. |
5. |
Test for infinite resistance
between the signal circuits listed below and ground: |
⇒ |
If less than the specified value, test the park
brake signal circuit for a short to ground. |
6. |
Test for less than 5 Ω
between the following signal circuit terminals: |
|
• |
Electric parking brake switch
harness terminal 1 and the electric parking brake control module
terminal N |
|
• |
Electric parking brake switch
harness terminal 2 and the electric parking brake control module
terminal C |
|
• |
Electric parking brake switch
harness terminal 3 and the electric parking brake control module
terminal B |
|
• |
Electric parking brake switch
harness terminal 7 and the electric parking brake control module
terminal D |
⇒ |
If greater than the specified range, test the
signal circuit for an open/high resistance. |
7. |
If all circuits test normal,
test or replace the S91 Electric Parking Brake Switch. If DTC
resets, replace the K83 Electric Parking Brake Control
Module. |
C0293 08
Remove the EPB fuse and reinstall. Verify DTC C0293 08 is not
set.
If DTC C0293 08 is set, replace the S91 Electric Parking Brake
Switch.
Component Testing
1. |
Ignition OFF, disconnect the
harness connector at the S91 Electric Parking Brake Switch.
|
2. |
Test for infinite resistance
between the terminals listed below with the switch in the inactive
state: |
|
• |
B+ terminal 4 and the park
brake switch signal terminal 1 |
|
• |
B+ terminal 4 and the park
brake switch signal terminal 2 |
|
• |
B+ terminal 5 and the park
brake switch signal terminal 1 |
|
• |
B+ terminal 5 and the park
brake switch signal terminal 2 |
|
• |
Park brake switch signal
terminal 3 and the park brake switch signal terminal 1 |
|
• |
Park brake switch signal
terminal 3 and the park brake switch signal terminal 2 |
|
• |
Park brake switch signal
terminal 7 and the park brake switch signal terminal 1 |
|
• |
Park brake switch signal
terminal 7 and the park brake switch signal terminal 2 |
⇒ |
If less than the specified range, replace the S91
Electric Parking Brake Switch. |
3. |
Test for less than 5 Ω
between the terminals listed below with the switch in the inactive
state: |
|
• |
Park brake switch signal
terminal 1 and terminal 2 |
|
• |
B+ terminal 4 and park brake
switch signal terminal 7 |
|
• |
B+ terminal 5 and park brake
switch signal terminal 3 |
⇒ |
If greater than the specified range, replace the
S91 Electric Parking Brake Switch. |
4. |
Test for less than 5 Ω
between the terminals listed below with the switch in the apply
position: |
|
• |
Park brake switch signal
terminal 1 and terminal 2 |
|
• |
B+ terminal 4 and park brake
switch signal terminal 1 |
|
• |
B+ terminal 4 and park brake
switch signal terminal 2 |
|
• |
B+ terminal 5 and park brake
switch signal terminal 3 |
⇒ |
If greater than the specified range, replace the
S91 Electric Parking Brake Switch. |
5. |
Test for less than 5 Ω
between the terminals listed below with the switch in the release
position: |
|
• |
Park brake switch signal
terminal 1 and terminal 2 |
|
• |
B+ terminal 5 and park brake
switch signal terminal 1 |
|
• |
B+ terminal 5 and park brake
switch signal terminal 2 |
|
• |
B+ terminal 4 and park brake
switch signal terminal 7 |
⇒ |
If greater than the specified range, replace the
S91 Electric Parking Brake Switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|