Buick Regal: DTC C0615, C0620, or C0625
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 provides an overview of each
diagnostic category.
DTC Descriptors
DTC C0615
Left Front Position Sensor Circuit
DTC C0620
Right Front Position Sensor Circuit
DTC C0625
Left Rear Position Sensor Circuit
For symptom byte information, refer to Symptom Byte List.
Diagnostic Fault Information
Circuit/System Description
The suspension control module supplies a 5 V reference voltage and a low
reference to each body
acceleration sensor. The body acceleration sensors supply a signal of 0.5 - 4.5
V to the suspension
control module.
Conditions for Running the DTC
System voltage is between 9 - 16 V
Conditions for Setting the DTC
The signal voltage is less than 0.5 V for 1.5 s
C0595 01, C0600 01, and C0605 01
The signal voltage is greater than 4.5 V for 1.5 s
C0595 02, C0600 02, and C0605 02
- The number of signal changes is less than specified value for 2.5 s.
- Vehicle speed is greater than 30 km/h (19 MPH)
Action Taken When the DTC Sets
- The electronic suspension control is disabled for the duration of the
ignition cycle.
- The driver information center displays the SERVICE SUSPENSION SYSTEM
message.
Conditions for Clearing the DTC
- A present DTC will clear on the next consecutive malfunction-free
ignition cycle.
- A history DTC will clear after 41 consecutive malfunction-free ignition
cycles.
Reference Information
Schematic Reference
Electronic Suspension Control Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEW INDEX
Description and Operation
Electronic Suspension Control Description and Operation
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 Testing
1. Ignition ON, verify that DTC C0870 is not present.
- If the DTC C0870 is present, refer to DTC C0870
- Go to next step: If the DTC C0870 is not present
2. Vehicle OFF and all vehicle systems OFF. Disconnect the harness connector
at the appropriate
B152 Suspension Position Sensor. It may take up to 2 min for all vehicle systems
to power down.
3. Test for less than 10 Ω between the low reference circuit terminal 2 and
ground.
- Vehicle OFF, disconnect the harness connector at the K19 Suspension
Control Module.
- Test for less than 2 Ω in the low reference circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K19 Suspension Control Module.
- Go to next step: If less than 10 Ω
4. Vehicle in Service Mode.
5. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.
- Vehicle OFF, disconnect the harness connector at the K19 Suspension
Control Module.
- Test for infinite resistance between the 5 V reference circuit and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the 5 V reference circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K19 Suspension Control Module.
- Vehicle OFF, disconnect the harness connector at the K19 Suspension
Control Module,
vehicle in Service Mode.
- Test for less than 1 V between the 5 V reference circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K19 Suspension Control Module.
- Go to next step: If within 4.8 - 5.2 V
6. Vehicle OFF, disconnect the harness connector at the K19 Suspension
Control Module, vehicle in
Service Mode.
7. Test for less than 1 V between the appropriate B152 Suspension Position
Sensor signal circuit
terminal 3 and ground.
Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
8. Vehicle OFF.
9. Test for infinite resistance between the appropriate B152 Suspension Position
Sensor signal circuit
terminal 3 and ground.
- If less than infinite resistance
Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
10. Test for less than 2 Ω between the appropriate B152 Suspension Position
Sensor signal circuit
terminal 3 and the K19 Suspension Control Module signal circuit listed below.
- Terminal 9
- Terminal 10
- Terminal 11
- If 2 Ω or greater
Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 Ω
11. Replace the appropriate B152 Suspension Position Sensor.
12. Verify the DTC does not set while operating the vehicle under Conditions for
Running the DTC.
Replace the K19 Suspension Control Module.
- Go to next step: If the DTC does not set
13. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic
procedure.
- Front Suspension 4 Corner Leveling System Position Sensor Replacement
- Rear Suspension 4 Corner Air Leveling Position Sensor Replacement (CNQ)Rear
Suspension 4 Corner Air Leveling Position Sensor Replacement (GNC)
- Control Module References for suspension control module replacement,
programming and
setup.
READ NEXT:
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.
Diag
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.
Diag
SEE MORE:
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 provides an overview of each
diagnostic category.
Circuit/System De
Special Tools
EN-45059 Angle Meter
Equivalent regional tools: Special Tools.
WARNING: Brake Dust Warning.
WARNING: Brake Fluid Irritant Warning.
CAUTION: Brake Fluid Effects on Paint and Electrical Components
Caution.
Removal Procedure
1. Remove the front tire and wheel assembly.
2. Front Disc Br