C10C5
C10C5-92 ELECTRONIC TRAILER BRAKE ACCELEROMETER-PERFORMANCE OR INCORRECT OPERATION
Theory of Operation
The Integrated Trailer Brake Module (ITBM) communicates with the vehicle through the high speed CAN C bus. The ITBM monitors the Brake Pedal Status, Vehicle Speed and ESP status via CAN message. It also outputs the Trailer Status, Gain Setting, and Trailer Brake Output Power to the vehicle. The ITBM connects to the electric trailer brakes through the 7-Way connector and controls the brake force through a Pulse Width Modulating (PWM) duty cycle.
NOTE: If there is no trailer connected there will be NO Pulse Width Modulating (PWM) signal.
The PWM is proportional to the rate of deceleration measured by the accelerometer inside the ITBM. The ITBM controls the PWM output to the trailer brakes in four ways. The first occurs while the brake pedal becomes active and vehicle speed is greater than 0 km/h (0 mph). The second is the manual lever on the ITBM that can be controlled by the driver. If both the manual lever and the brake pedal are active simultaneously, the greater of the two, in terms of PWM output, will prevail. The third is after the vehicle has stopped moving, after approximately three seconds of the brake pedal applied the trailer brakes will be applied too. This is to minimize hitch to trailer noise and vehicle roll back when taking off from a stop and on an incline. The fourth is that it will become active during an ESP trailer sway event.
- When Monitored:
Continuous.
- Set Condition:
If the Integrated Trailer Brake Module (ITBM) has an internal accelerometer that has a duty cycle of less than 5% or greater than 95% or if the accelerometer fails the internal self test which is executed every time the ignition is turned on, this code will set. Automatic braking is disabled, manual lever is still functional.
1.
NOTE: The appropriate trailer or trailer simulator must be present for the results of this test to be valid.
NOTE: This DTC must be active for the results of this test to be valid.
DTC IS ACTIVE
1. Connect the appropriate trailer or trailer simulator to the vehicle.
2. Ignition on, engine not running.
3. With the scan tool, record and erase DTCs.
4. Cycle the ignition from on to off and back to on several times, waiting 5 seconds between each ignition state.
5. With the scan tool, read DTCs.
Is the status Active for this DTC?
Yes
- Go To 2
No
- Go To 4
2. INTEGRATED TRAILER BRAKE MODULE (ITBM) ACCELEROMETER
1. Apply the trailer brakes by pressing the manual lever on the ITBM.
Are the trailer brakes operating correctly?
Yes
- Go To 3
No
- Trailer wiring/brakes are in operative, refer the customer to an authorized trailer dealer.
3. INTEGRATED TRAILER BRAKE MODULE (ITBM)
1. Turn ignition off to the lock position.
2. Disconnect the trailer.
3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Pay particular attention to all Power and Ground circuits.
Were there any problems found?
Yes
- Repair as necessary.
- Perform the ITBM VERIFICATION TEST. Integrated Trailer Brake Module (ITBM) Verification Test.
No
- Replace the Integrated Trailer Brake Module (ITBM). Integrated Trailer Brake Module - Removal.
4. INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
4. Look for the data to change or for the DTC to reset during the wiggle test.
5. While monitoring the scan tool data relative to this circuit.
6. Look for the data to change other than as expected or for the DTC to reset.
Were any problems found?
Yes
- Repair as necessary.
- Perform the ITBM VERIFICATION TEST. Integrated Trailer Brake Module (ITBM) Verification Test.
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time.