NO.5 ABS WARNING LIGHT STAYS ON 4 S OR MORE WITH SWITCH THE IGNITION TO ON [ABS]


id0403a5950700

5

ABS warning light stays on 4 s or more with switch the ignition to ON

Possible cause
•  Communication network malfunction
•  ABS HU/CM DTC is stored
•  Instrument cluster malfunction
•  ABS CM internal malfunction
•  ABS HU/CM connector is not connected securely
•  Battery malfunction
•  Charging system malfunction
•  Open circuit in ABS HU/CM ground circuit
•  ABS HU/CM power supply circuit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR OPEN CIRCUIT AND SHORT CIRCUIT
•  Retrieve the ABS HU/CM DTC using the M-MDS.
•  Is any error message displayed regarding communication between ABS HU/CM and M-MDS?
Yes
If the communication error message is displayed even after inspecting according to the procedure displayed on the M-MDS:
•  Go to Step 6.
No
Go to the next step.
2
CONFIRM ABS HU/CM DTC
•  Retrieve the ABS HU/CM DTC using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Inspect the instrument cluster.
If the instrument cluster is normal:
•  Go to the next step.
If the instrument cluster has a malfunction:
•  Replace the instrument cluster.
3
CONFIRM INSTRUMENT CLUSTER DTC
•  Retrieve the instrument cluster DTC using the M-MDS.
•  Is the DTC U0415:92 present?
Yes
Go to the next step.
No
Go to Step 6.
*4
INSPECT ABS HU/CM POWER SUPPLY VOLTAGE
•  Access the VPWR PID using the M-MDS.
•  Is the VPWR PID value above 10 V?
Yes
Replace the ABS CM (ABS CM internal malfunction).
No
Go to the next step.
5
INSPECT WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER OR ELSEWHERE
•  Release the parking brake.
•  Turn on all the warning light and indicator light using the M-MDS simulation function WL+IL.
•  Does the ABS warning light turn off?
Yes
Go to the next step.
No
Replace the instrument cluster.
6
INSPECT FOR CONNECTION OF ABS HU/CM CONNECTOR
•  Inspect for connection of ABS HU/CM connector.
•  Is the ABS HU/CM connector connected securely?
Yes
Go to Step 8.
No
Reconnect the ABS HU/CM connector securely, then go to the next step.
7
VERIFY ABS WARNING LIGHT OPERATION
•  Switch the ignition to off, then to ON.
•  Does the ABS warning light turn off 4 s after the ignition is switched to ON.
Yes
Symptom troubleshooting is completed (ABS HU/CM connector is not connected securely).
No
Go to the next step.
8
INSPECT BATTERY
•  Measure the battery voltage.
•  Is the battery voltage normal?
Yes
Go to the next step.
No
Inspect the battery and charging system.
Repair or replace the malfunctioning part according to the inspection results.
9
INSPECT BATTERY VOLTAGE WHILE ELECTRICAL LOAD IS OPERATING
•  Inspect the battery voltage while electrical load (A/C, headlight etc.) is operating.
•  Is the battery voltage normal?
Yes
Inspect the wiring harness in ABS HU/CM terminal N and terminal B related circuit.
Repair or replace the suspected wiring harness if necessary.
No
Inspect the charging system (such as drive belt tension and generator).
Repair or replace the malfunctioning part according to the inspection results.

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