Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Cadillac >> 2004 >> Escalade EXT >> Repair and Diagnosis >> Brakes >> Antilock Brake System, Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0186: Lateral Accelerometer Circuit Malfunction >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests the sensor circuitry in the high voltage range.
  2. 4:  This step tests the sensor circuitry in the low voltage range.
DTC C0186

Step Action Values Yes No
IMPORTANT: If DTC C0292 is set, diagnose C0292 before proceeding with diagnostics for C0186.
If DTC C0196 is set, diagnose C0196 before proceeding with diagnostics for C0186.
Always use connector test adapters when performing tests to avoid damage to delicate connector terminals.
Do not turn OFF the ignition during this diagnostic procedure unless the step in the table instructs you to do so. The scan tool may display some incorrect data if the ignition is cycled.
Schematic Reference: ABS Schematics Connector End View Reference: ABS Connector End Views 
1 Did you perform the Antilock Brake System (ABS) Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - ABS (W/O JL4)  or Diagnostic System Check - ABS (W/JL4) 
2
  1. Use the scan tool to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn ON the ignition.
  2. Disconnect the yaw rate sensor/lateral accelerometer harness connector. Refer to Yaw Rate Sensor/Lateral Accelerometer Replacement .
  3. Select the Vehicle Stability Enhancement System (VSES) Data Display function on the scan tool.
  4. Connect a 3 amp fused jumper wire between the yaw rate sensor/lateral accelerometer 5-volt reference circuit and the lateral accelerometer signal circuit. Refer to Using Fused Jumper Wires in Wiring Systems.
  5. Observe the Lateral Accelerometer Sensor Input on the scan tool.
Is the Lateral Accelerometer Sensor Input voltage greater than the specified value?		 4.4 V Go to Step 4  Go to Step 5 
4 
  1. Remove the fused jumper wire from the yaw rate sensor/lateral accelerometer harness connector.
  2. Observe the Lateral Accelerometer Sensor Input on the scan tool.
Is the Lateral Accelerometer Sensor Input voltage less than the specified value?		 0.6 V Go to Step 6  Go to Step 9 
5 Test the lateral accelerometer signal circuit for the following conditions.
  • An open
  • A high resistance
  • A short to ground

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
6
  1. Inspect for poor connections at the harness connector of the yaw rate sensor/lateral accelerometer. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
  2. Ensure the yaw rate sensor/lateral accelerometer is mounted securely and that the mounting bracket is not bent or otherwise damaged.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
8
IMPORTANT: The Yaw Rate Reference Table Reset Procedure must be performed when you are instructed to do so during the Yaw Rate Sensor/Lateral Accelerometer Replacement procedure.
Replace the yaw rate sensor/lateral accelerometer. Refer to Yaw Rate Sensor/Lateral Accelerometer Replacement .Did you complete the replacement?		 - Go to Step 10  -
9
IMPORTANT: Following EBCM replacement, perform the set-up procedure for the EBCM and perform the Yaw Rate Reference Table Reset Procedure. Use the scan tool to perform the Tire Size Calibration procedure.
Replace the EBCM. Refer to Electronic Brake Control Module Replacement (w/ JL4)  or Electronic Brake Control Module Replacement (w/o JL4) .Did you complete the replacement?		 - Go to Step 10  -
10
  1. Use the scan tool Clear All Class 2 DTCs function to clear all of the DTCs from all modules.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 3  System OK
scientia non olet · About Mike's Workshop Manuals