B274A
DTC B274A
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.
DTC Descriptors
DTC B274A 02
-
Performance Traction Switch- Short To Ground
DTC B274A 05
-
Performance Traction Switch - Short To Battery or Open
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.
Conditions for Running the DTC
* Battery voltage is between 9-16 volts
* Ignition ON for 30 seconds
Conditions for Setting the DTC
The suspension control switch signal circuit to the BCM is shorted to ground, shorted to voltage, or open for greater than 1.0 second.
Action Taken When the DTC Sets
* The suspension control switch will be inoperative.
* The suspension dampening will remain in the currently selected mode.
Conditions for Clearing the DTC
* A current DTC will clear on the next consecutive malfunction-free ignition cycle.
* A history DTC will clear after 50 consecutive malfunction-free ignition cycles.
Reference Information
Schematic Reference
Electronic Suspension Control Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Folding Top 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
Ignition ON, using a scan tool, verify the Ride Handling Sw. data parameters change states while switching between SPORT and TOUR modes.
Circuit/System Testing
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. With the switch in the resting position, test for 9100-9350 ohms between the signal circuit terminal 10 and the ground circuit terminal 6 at the switch.
• If not within the specified range, replace the suspension control switch.
4. Test the signal circuit for a short to voltage, short to ground, or open/high resistance. If the circuit tests normal, replace the BCM.
Repair Instructions
* Electronic Suspension Switch Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, programming, and setup
Repair Verification
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.