Suspension Control Switch Malfunction (ZR1)
Suspension Control Switch Malfunction (ZR1)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The suspension control switch is a rotary type switch that has a normal resting position and two momentary TOUR and SPORT positions. When the switch is in the resting position, a signal of approximately 9271 ohms is received by the body control module (BCM). When the switch is momentarily placed in the SPORT position, a signal of approximately 931 ohms is received by the BCM. When the switch is momentarily placed in the TOUR position, a signal of approximately 3081 ohms is received by the BCM. In either case, the BCM then sends a serial data message to the electronic suspension control (ESC) module to modify the shock damper rates which will change the ride and handling characteristics of the vehicle and also ground the appropriate control circuit to illuminate the appropriate mode indicator on the switch.
Reference Information
Schematic Reference
Electronic Suspension Control Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views 5 Bow Lowered Switch (CM7)
Description and Operation
Electronic Suspension Control Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, with the scan tool, observe the Ride Handling Sw. data parameter in the BCM Chassis data list while switching the suspension control switch between the TOUR and SPORT positions. The parameter should change state.
• If the parameter does not change state , refer to Suspension Switch Malfunction.
2. Ignition ON, verify that the SPORT and TOUR mode indicators illuminate ON and OFF while momentarily switching the suspension control switch between the SPORT and TOUR positions.
• If an indicator does not illuminate or is always illuminated, refer to SPORT/TOUR Mode Indicator Malfunction.
Circuit/System Testing
Suspension Switch Malfunction
1. Ignition OFF, disconnect the suspension control switch.
2. Test for less than 30 ohms between the switch harness connector ground terminal 6 and ground.
• If greater than the specified range, test for an open/high resistance.
3. While holding the suspension control switch in the in the SPORT position, test for 900-950 ohms between the signal circuit terminal 10 and the ground terminal 6 at the switch.
• If not within the specified range, replace the suspension control switch.
4. While holding the suspension control switch in the in the TOUR position, test for 2900-3150 ohms between the signal circuit terminal 10 and the ground terminal 6 at the switch.
• If not within the specified range, replace the suspension control switch.
5. Test for less than 5 ohms between the suspension control switch harness connector signal circuit terminal 10 and the BCM harness connector signal circuit terminal 70 X1.
• If greater than the specified range, test for an open/high resistance in the signal circuit. If all circuits test normal, replace the BCM.
SPORT/TOUR Mode Indicator Malfunction
1. Ignition OFF, disconnect the electronic suspension control (ESC) module.
2. Verify that the SPORT and TOUR mode indicators are not illuminated.
• If either indicator is illuminated, test the control circuits for a short to ground. If all circuits test normal, replace the suspension control switch.
3. Ignition ON, connect a 5 A fused jumper between the SPORT mode indicator control circuit terminal 8 and ground. Verify that the SPORT mode indicator illuminates.
• If the indicator does not illuminate, test the control circuit for an open/high resistance or short to voltage. If all circuits test normal, replace the suspension control switch.
4. Connect a 5 A fused jumper between the TOUR mode indicator control circuit terminal 9 and ground. Verify that the TOUR mode indicator illuminates.
• If the indicator does not illuminate, test the control circuit for an open/high resistance or short to voltage. If all circuits test normal, replace the suspension control switch.
5. If all circuits test normal, replace the ESC module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Electronic Suspension Switch Replacement Service and Repair
* Control Module References Control Module References for BCM and ESC module replacement, programming and setup