Important notes on checking for crossed connections while troubleshooting: The hydraulic connections to the hydraulic modulator can be crossed over; the ECU self-diagnosis will not detect it as a fault; nor will it cause the system to be shut down or cause a fault code to be logged in the ECU. Table of ABS 9 – Fall-back level: WARNING Normal brake pedal travel is required, but power assisted braking is available without any change in the braking efficiency NOTE The hydraulic connections to the hydraulic modulator can be crossed over; the ECU self-diagnosis will not detect it as a fault; nor will it cause the system to be shut down or cause a fault code to be logged in the ECU. When the hydraulic modulator is exchanged or repaired, the brake pipes to the solenoids must be tested for correct assignment using a diagnostics tester. When the inlet and outlet valve are activated, e.g. on the front left wheel, this must generate the necessary changes at the wheel. If this does not happen, the pipes have been crossed over. This will cause the system to function incorrectly WARNING When the hydraulic modulator is exchanged or repaired, the brake pipes to the solenoids must be tested for correct assignment using a diagnostics tester. When the inlet and outlet valve are activated, e.g. on the front left wheel, this must generate the necessary changes at the wheel. If this does not happen, the pipes have been crossed over. This will cause the system to function incorrectly. ABS FALLBACK LEVEL ABS WARNING LAMP BRAKE COM LAMP STATUS SYSTEM SYSTEM ACTIVE LAMP SYSTEM ACTIVE LAMP System active with limitation YES ON NO ON System active YES OFF YES OFF Emergency - EBD NO ON YES OFF System passive NO ON NO ON BRAKE (LR) 47
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