Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Patriot and 2009 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.

ESP/TCS SWITCH CIRCUIT
NOTE: If any other DTCs are present they must be repaired before continuing.
1. Turn the ignition on.
2. Turn the ESP/TCS switch on then off.
3. Check for car icon on solid in cluster and pressing ESP/TCS switch does not change state.
4. With the scan tool, read the switch state for the ESP/TCS switch with NO pressure on the brake, read and record DTCs.
  Does the scan tool display switch state indicating pressed?
  
  Yes
  - Go to step 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.
  - Perform the ABS-INTERMITTENT CONDITION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
(Z906) OPEN CIRCUIT

Fig 1: Checking ESP/TCS Switch Ground Circuit For Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the ESP/TCS switch.
3. Using a 12-volt test light connected to 12-volts, check the (Z906) ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go to step 3
  No
  - Repair (Z906) ground circuit for an open circuit or high resistance.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
CHECK FOR A STUCK ESP/TCS SWITCH

Fig 2: CHECKING FOR STUCK ESP/TCS SWITCH
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the internal resistance of the ESP/TCS Switch between the (B46) ESP/TCS control circuit and (Z906) Ground circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Replace the ESP/TCS Switch in accordance with the Service Information.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
  No
  - Go to step 4
ESP/TCS CONTROL CIRCUIT

Fig 3: CHECKING ESP/TCS CONTROL CIRCUIT FOR SHORT TO GROUND
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the ESP/TCS Switch.
3. Disconnect the Anti-Lock Brake Module harness connector.
4. Measure the resistance of the (B46) ESP/TCS control circuit to ground.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (B46) ESP/TCS control circuit for a short to ground.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
  No
  - Replace the Anti-Lock Brake Module in accordance with the Service Information.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .