Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DDRP (De-Coupled Dynamic Rear Proportioning) Description
DDRP (De-coupled Dynamic Rear Proportioning) is proportioning system to maintain vehicle stability during braking. In normal braking condition, equal wheel speed should be maintained for efficient and balanced braking. In hard braking condition, a vehicle requires relatively less brake force at rear wheel due to vehicle's weight transfer to the front. DDRP maintains desired brake pressure to the rear wheel by using the ABS rear inlet and outlet valve in order to provide efficient braking and vehicle stability. In DDRP system, Power to the Rear Hold Valve Solenoid is provided from Ignition. If the following fault conditions are existing, The Red Brake Warning Lamp will be illuminated.
- Two Wheel Speed Sensors inoperative on same axle.
- Rear inlet solenoid inoperative.
- Battery 2 (Motor Input) short to ground.
- Battery 1 (EBCM Input) open or short to the ground.
- Motor ground open or short to battery.
- EBCM ground open or short to battery.
- Ignition open or short to ground.
| Part | Hypothesized Failure | De-coupled DRP | ||
|---|---|---|---|---|
| ABS Warning Lamp | Brake Warning Lamp | D-DRP Status | ||
| Sensor RF | Short or Open | ON | - | Degraded |
| Sensor LF | Short or Open | ON | - | Degraded |
| Sensor RR | Short or Open | ON | - | Degraded |
| Sensor LR | Short or Open | ON | - | Degraded |
| Two Sensors, Same Axle | Short or Open | ON | ON | Disabled |
| One Front & One Rear Sensor | Short or Open | ON | - | Degraded |
| Motor | Short to Ground - LOW Side | ON | - | Degraded |
| Short to Ground - HI Side | ON | - | Degraded | |
| Short to Battery - LOW Side | ON | - | Degraded | |
| Short to Battery - HI Side | - | - | None | |
| Motor Circuit Open | ON | - | Degraded | |
| Motor Stalled | ON | - | Degraded | |
| Front Apply Solenoids | Short or Open | ON | - | Degraded |
| Front Release Solenoids | Short or Open | ON | - | Degraded |
| Rear Apply Solenoids | Short or Open | ON | - | Degraded |
| Rear Release Solenoids | Short or Open | ON | ON | Degraded |
| System Relay | Open (Unable to turn on) | ON | - | Degraded |
| Shorted On (Unable to turn off) | - | - | None | |
| Battery 2 (Motor) | Short to GND | ON | ON | Degraded |
| Open | - | - | Low Voltage | |
| Ground (Motor) | Open or Short To Batt | ON | - | Enabled |
| Battery 1 (ECU, Solenoids) | Open or Short To GND | ON | ON | Disabled |
| Ground (ECU, Solenoids) | Open or Short To Batt | ON | ON | Disabled |
| Ignition | Open or Short To GND | ON | ON | Disabled |
| Brake Switch | Not Applicable | - | - | |
| Serial Communication | Open or Short | ON | ON | Enabled |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.