NO.4 ABS WARNING LIGHT STAYS ON

BME040343000208

• 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.

4

ABS warning light stays on

[TROUBLESHOOTING HINTS]

• ABS HU/CM detects ABS system malfunction.

• ABS HU/CM detects low voltage in power supply (ABS HU/CM terminal Z voltage is below about 10 V or above about 8.5 V).

• Warning light circuit 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)
- ABS_VOLT (power supply voltage)
• Is ABS_LAMP 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 ABS warning light terminal W to body ground.
• Does ABS 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 terminal W and instrument cluster connector (16-pin) terminal 1B?
Yes
Replace instrument cluster (open or ground to short in instrument cluster).
No
Repair wiring harness between ABS HU/CM (terminal W) and instrument cluster.
6
• Check the voltage for PID/DATA monitor ABS_VOLT item.

Specification: above more than 10V

• Is voltage at specification?
Yes
Replace ABS HU/CM (open or ground to short 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 terminal W securely connected?
Yes
Go to Step 11.
No
Connect ABS HU/CM connector terminal W securely, then go to next step.
10
• Does ABS warning light go out after more than 4 seconds with ignition switch ON?
Yes
Temporary poor connection of terminal.
Inspect ABS HU/CM 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 12V 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)).