NO.4 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON MORE THAN 4 SECONDS WITH IGNITION SWITCH ON [APPLIED VIN (ASSUMED): JM0 DY10Y100 108402-, JM6 DY10*100 109001-]

id0403a3808800

4

Both ABS warning light and BRAKE system warning light stay on more than 4 seconds with ignition switch on.

[TROUBLESHOOTING HINTS]

• ABS HU/CM detects ABS proportioning system malfunction.

• ABS HU/CM detects low voltage in power supply (ABS CM ignition terminal N voltage is below about 8 V).

• ABS HU/CM does not operate.

• Malfunction of communication network.

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT ABS HU/CM POWER SUPPLY FUSE
• Is ABS HU/CM ignition power supply fuse normal?
Yes
Go to next step.
Inspect for a short to ground on blown fuse's circuit.
No
Repair or replace as necessary.
Install appropriate amperage fuse.
2
INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS
• 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 procedure displayed on WDS or equivalent, go to step 6.
No
Go to next step.
3
INSPECT FOR DTCS IN ABS HU/CM
• Have DTCs been recorded in memory?
Yes
Perform inspection using appropriate DTC.
No
Inspect instrument cluster.
If instrument cluster is OK, then go to next step.
If instrument cluster malfunction repair instrument cluster, then go to next step.
4
INSPECT BATTERY
• Is battery voltage normal?
Yes
Go to next step.
No
Inspect battery and charging system.
5
INSPECT CHARGING SYSTEM
• Is battery voltage normal with electrical load (A/C, headlight, etc.) on and engine idling?
Yes
Go to next step.
No
Inspect charging system (drive belt tension, generator, etc.).
6
INSPECT ABS HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL N)
• Disconnect ABS HU/CM connector.
• Turn ignition switch to ON.
• Inspect the voltage of connector terminal N.

• Specification: approx. 8 V

• Is voltage within specification?
Yes
Replace ABS CM (open or short in ground circuit in ABS CM).
No
Repair wiring harness between ABS HU/CM and ground.
7
INSPECT WIRING HARNESS BETWEEN ABS HU/CM GROUND FOR CONTINUITY
• Turn ignition switch to LOCK.
• Is there continuity between connector terminal B and ground?
Yes
If a malfunction error message is display on WDS or equivalent in Step 1 inspection, go to next step.
If a malfunction error message is not displayed on WDS or equivalent in Step 1 inspection, troubleshooting is completed.
No
Repair wiring harness between ABS HU/CM and ground.
8
INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY
• Is there continuity between connector terminal H, L and DLC-2?.
Yes
Go to next step.
No
Repair wiring harness between ABS HU/CM and DLC-2.
9
INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO BATTERY
• Is voltage approx. 12 V at connector terminal H, L?
Yes
Repair wiring harness between ABS HU/CM and DLC-2.
No
Go to next step.
10
INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND
• Is there continuity between connector terminal H, L and DLC-2?
Yes
Repair wiring harness between ABS HU/CM and DLC-2.
No
Replace ABS CM (communication circuit malfunction in ABS CM)