NO.3 ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON

BME040343000207

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and undamaged.

3

ABS warning light and BRAKE system warning light stay ON

[TROUBLESHOOTING HINTS]

• ABS HU/CM detects ABS proportioning system malfunction

• ABS HU/CM detects low voltage in power supply (ABS HU/CM terminal Z voltage is below about 8.5 V.)

• ABS HU/CM does not operate

• Both warning light circuits (ABS and BRAKE system) open

Diagnostic procedure

STEP

INSPECTION

ACTION

1
• Perform DTC inspection.
• Is error message displayed regarding communication between ABS HU/CM and WDS or equivalent?
Yes
If a communication error message is displayed even after inspecting according to procedures displayed on the WDS or equivalent, go to Step 7.
No
Go to next step.
2
• Have DTCs been recorded in memory?
Yes
Perform inspection using appropriate DTC.
No
Go to next step.
3
• Inspect the following items using WDS or equivalent.
- ABS_LAMP (ABS warning light)
- BRAKE_LMP (BRAKE system warning light)
- ABS_VOLT (power supply voltage)
• Is ABS_LAMP and/or BRAKE_LMP on after more than 4 seconds with ignition switch ON?
Yes
Go to Step 6.
No
Go to next step.
*4
• Disconnect ABS HU/CM connector. Connect SST (adapter harness) (vehicle harness side only).
• Use the SST (adapter harness) connector to ground the warning light terminal (ABS: terminal W, BRAKE system: terminal X) to body ground.
• Do both ABS warning light and BRAKE system warning light go out with ignition switch ON?
Yes
Replace ABS HU/CM (open circuit in ABS HU/CM).
No
Go to next step.
*5
• Is there continuity between following SST (adapter harness) connector terminals and instrument cluster connector (16-pin, 24-pin) terminals?
- Terminal W and 1B
- Terminal X and 3S
Yes
Replace instrument cluster (open or ground to short in instrument cluster).
No
Repair wiring harness between ABS HU/CM (ABS warning light: terminal W, BRAKE system warning light: terminal X) and instrument cluster.
6
• Check the voltage for PID/DATA monitor ABS_VOLT item.

Specification: above 10 V

• Is voltage within specification?
Yes
Replace ABS HU/CM (open or short circuit to B+ in ABS HU/CM).
No
Go to next step.
7
• Is battery voltage normal?
Yes
Go to next step.
No
Perform inspection of battery and charging system.
8
• Is battery voltage normal with electrical load (A/C, headlights, etc.) on while engine is idling?
Yes
Go to next step.
No
Perform inspection of charging system (drive belt tension, generator, etc.).
9
• Is ABS HU/CM connector securely connected?
Yes
Go to Step 11.
No
Connect ABS HU/CM connector securely, then go to next step.
10
• Do both ABS warning light and BRAKE system warning lights go out after more than 4 seconds with ignition switch ON?
Yes
Temporary poor connection in ABS HU/CM connector.
Inspect connector and terminal.
No
Inspect and repair wiring harness for ABS HU/CM power supply (terminal Z) and ground 1 (terminal AA)).
*11
• Disconnect ABS HU/CM connector. Connect SST (adapter harness) (vehicle harness side only).
• Is there continuity between SST (adapter harness) connector terminal T and DLC-2?
Yes
Go to next step.
No
Repair wiring harness between ABS HU/CM and DLC-2.
*12
• Is voltage approximately 12 V at SST (adapter harness) connector terminal T?
Yes
Repair wiring harness between ABS HU/CM and DLC-2.
No
Go to next step.
*13
• Is there continuity between SST (adapter harness) connector terminal T and ground?
Yes
Repair wiring harness between ABS HU/CM and DLC-2.
No
Inspect and repair wiring harness for ABS HU/CM power supply (terminal Z) and ground 1 (terminal AA)).