ESP Switch Circuit

ESP SWITCH CIRCUIT





For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .


- When Monitored:
With the ignition on.

- Set Condition:
When the Anti-Lock Brake Module indicates that the ESP Switch is low for 30 seconds.






Diagnostic Test


1. ESP SWITCH CIRCUIT
NOTE: If any other DTCs are present they must be repaired before continuing.

Turn the ignition on.
Turn the ESP switch on then off.
Check for car icon on solid in cluster and pressing ESP switch does not change state.
With the scan tool, read the switch state for the ESP switch with NO pressure on the brake, read and record DTCs.
Does the scan tool display switch state indicating pressed?

Yes


- Go To 2


No


- The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Refer to the ABS-INTERMITTENT CONDITION TEST.ABS Intermittent Condition Test


2. (Z905) OPEN CIRCUIT




Turn the ignition off.
Disconnect the ESP switch.
Using a 12-volt test light connected to 12-volts, check the (Z905) ground circuit.
Does the test light illuminate brightly?

Yes


- Go To 3


No


- Repair (Z905) ground circuit for an open circuit or high resistance.
- Perform ABS VERIFICATION TEST.ABS Verification Test


3. CHECK FOR A STUCK ESP SWITCH




Turn the ignition off.
Measure the internal resistance of the ESP Switch between the (B46) ESP control circuit and (Z905) Ground circuit.
Is the resistance below 5.0 ohms?

Yes


- Replace the ESP Switch.
- Perform ABS VERIFICATION TEST.ABS Verification Test


No


- Go To 4


4. ESP CONTROL CIRCUIT




Turn the ignition off.
Disconnect the ESP Switch.
Disconnect the Anti-Lock Brake Module harness connector.
Measure the resistance of the (B46) ESP control circuit to ground.
Is the resistance below 5.0 ohms?

Yes


- Repair the (B46) ESP control circuit for a short to ground.
- Perform ABS VERIFICATION TEST.ABS Verification Test


No


- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST.ABS Verification Test