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• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5 V Reference | C0110 00, C0880 00, C0880 02, C029C 5A, C120F 00, C12E0. 00, C12E5 00 | C0110 00, C029C 03, C129A 00, C029 07, C029C 5A, C129E 00, C12E0 00 | C0110 00, C0880 00, C029C 5A, C12E0 00, C12E5 00 | C12B1 00, C12F8 00 |
Brake Control Brake Pedal Position Sensor Circuit 1 Terminal 4 | C029C 03, C129A 00 | C029C 03, C129A.00 | C0110 00, C0880 00, C029C 5A, C12E0 00, C12E5 00 | C12B1 00, C12F8 00 |
Brake Control Brake Pedal Position Sensor Circuit 2 Terminal 6 | C029C 03, C129D 00 | C0110 00, C029C 07, C129E 00, C12E0 00 | C0110 00, C029C 07, C129E 00, C12E0 00 | C12B1 00, C12F8 00 |
Low Reference | - | C0110 00, C0294 00, C029C 07, C029C 5A, C129E 00, C12E0 00, C12F8 00 | - | C12B1 00, C12F8 00 |
The electronic brake control module uses input from the brake control brake pedal position sensor and the brake pedal position sensor to determine when the brake pedal is being applied and with how much force. These inputs are used to determine the driver's braking intent which is used to control the amount of pressure applied to the wheels.
• | Ignition voltage is greater than 10 V. |
• | Vehicle ON or Vehicle in Service Mode. |
• | The electronic brake control module detects an open in the low reference circuit. |
• | The electronic brake control module detects that the two signal circuits do not match each other. |
• | The ABS indicator turns ON. |
• | The red brake indicator turns ON. |
• | The traction control/stability control indicator turns ON. |
• | The Service Brake Assist and Service StabiliTrak messages are displayed on the driver information centre. |
• | The electronic brake control module disables the antilock brake system, the dynamic rear proportioning, the traction control system and the electronic stability control for the duration of the drive cycle. |
• | The condition for setting the DTC is no longer present. |
• | The history DTC will clear after 40 consecutive fault-free drive cycles have occurred. |
Antilock Brake System Schematics
Control Module References for scan tool information
Note: The 12 V battery must be able to maintain a charge during this brake sensor performance procedure. It is recommended that a charger/maintainer or equivalent be used to maintain proper battery voltage during this procedure.
Note: Do not depress the brake pedal during the Electronic Brake Control Module Learn.
Note: To ensure the complete brake modulator and high pressure accumulator pressure relief procedure is allowed to occur; the brake controller must see 1 pedal apply with the propulsion system enabled, followed by a proper shutdown without applying the brake pedal.
Note: Vehicle OFF, without applying the brake pedal ensure the brake modulator and high pressure accumulator pressure relief occurs. This process will take approximately 1-3 minutes.
• | Brake Controls Brake Pedal Position Sensor 5 V Supply Voltage - Between 4.75-5.25 V. |
• | Brake Controls Brake Pedal Position Sensor Circuit 1 - Between 1.4-1.7 V |
• | Brake Controls Brake Pedal Position Sensor Circuit 2 - Between 58 78% |
⇒ | If any parameter is not within the specified range |
Refer to Circuit/System Testing. |
⇓ | If all parameters are within the specified range |
• | Brake Master Cylinder Pressure Sensor - Less than 100 kPa (15 psi) |
• | Brake Pressure Sensor - Less than 100 kPa (15 psi) |
• | High Pressure Accumulator Sensor - Less than 800 kPa (116 psi) |
⇒ | If any parameter is greater than the specified range |
Replace the Q5 brake pressure modulator. |
⇓ | If all parameters are less than the specified range |
⇒ | If the brake hydraulic system test does not pass |
Repair as necessary. |
⇓ | If the brake hydraulic system tests normal |
⇒ | If the DTC sets |
K17 electronic brake control module. |
⇓ | If the DTC does not set |
⇒ | If 5 Ω or greater |
3.1. | Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module. |
3.2. | Test for less than 2 Ω in the low reference circuit end to end. |
⇒ | If 2 Ω or greater, repair the open/high resistance in the circuit. |
⇒ | If less than 2 Ω, replace the K17 electronic brake control module. |
⇓ | If less than 5 Ω |
⇒ | If less than 4.8 V |
5.1. | Ignition OFF, disconnect the harness connector at the K17 electronic brake control module. |
5.2. | Test for infinite resistance between the 5 V reference circuit and ground. |
⇒ | If less than infinite resistance, repair the short to ground on the circuit. |
⇓ | If infinite resistance |
5.3. | Test for less than 2 Ω in the 5 V reference circuit end to end. |
⇒ | If 2 Ω or greater, repair the open/high resistance in the circuit. |
⇒ | If less than 2 Ω, replace the K17 electronic brake control module. |
⇒ | If greater than 5.2 V |
5.1. | Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode. |
5.2. | Test for less than 1 V between the 5 V reference circuit and ground. |
⇒ | If 1 V or greater, repair the short to voltage on the circuit. |
⇒ | If less than 1 V, replace the K17 electronic brake control module. |
⇓ | If between 4.8-5.2 V |
⇒ | If 1 V or greater |
6.1. | Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode. |
6.2. | Test for less than 1 V between the signal circuit terminal 4 and ground. |
⇒ | If 1 V or greater, repair the short to voltage on the circuit. |
⇒ | If less than 1 V, replace the K17 electronic brake control module. |
⇓ | If less than 1 V |
⇒ | If 4.5 V or less |
8.1. | Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module. |
8.2. | Test for infinite resistance between the signal circuit terminal 4 and ground. |
⇒ | If less than infinite resistance, repair the short to ground on the circuit. |
⇓ | If infinite resistance |
8.3. | Test for less than 2 Ω in the signal circuit end to end. |
⇒ | If 2 Ω or greater, repair the open/high resistance in the circuit. |
⇒ | If less than 2 Ω, replace the K17 electronic brake control module. |
⇓ | If greater than 4.5 V |
⇒ | If 80% or less |
9.1. | Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module. |
9.2. | Test for infinite resistance between the signal circuit terminal 6 and ground. |
⇒ | If less than infinite resistance, repair the short to ground on the circuit. |
⇒ | If infinite resistance, replace the K17 electronic brake control module. |
⇓ | If greater than 80% |
⇒ | If 10% or greater |
11.1. | Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode. |
11.2. | Test for less than 1 V between the signal circuit terminal 6 and ground. |
⇒ | If 1 V or greater, repair the short to voltage on the circuit. |
⇓ | If less than 1 V |
11.3. | Vehicle OFF. |
11.4. | Test for less than 2 Ω in the signal circuit end to end. |
⇒ | If 2 Ω or greater, repair the open/high resistance in the circuit. |
⇒ | If less than 2 Ω, replace the K17 electronic brake control module. |
⇓ | If less than 10% |
Perform the Diagnostic Repair Verification after completing the repair.
• | Control Module References for electronic brake control module replacement, programming and setup |
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