ABS Warning Light Circuit

CIRCUIT DESCRIPTION

If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At this time, the ECU records a DTC in memory.

After removing the short pin of the DLC1, connect between terminals Tc and E1 of the DLC1 to make the ABS warning light blink and output the DTC.

WIRING DIAGRAM

Dlc1 Connector

INSPECTION PROCEDURE

Troubleshooting in accordance with the chart below for each trouble symptom.

ABS warning light does not light up

Go to step 1

ABS warning light remains on

Go to step 3

1

Check ABS warning light.

See Combination Meter Troubleshooting on page BE-2 .

Continuity C®

Continuity (AS)

Open

Continuity

Continuity (AS)

Continuity

R14139 R14140

R141

PREPARATION:

Disconnect the connectors from the control relay. CHECK:

Check the continuity between each terminal of the ABS control relay.

Terminals A7-1 and A6-3

Terminals A7-5 and A7-6

Terminals A7-2 and A7-5

Continuity (Reference value 80 Q)

Continuity

Open

CHECK:

(a) Apply battery voltage between terminals A7-1 and A6-3.

(b) Check the continuity between each terminal of the ABS control relay.

Terminals A7-5 and A7-6

Terminals A7-2 and A7-5

Open

Continuity

CHECK:

Connect the ■ test lead to terminal of A7-4 and the © lead to terminal A7-5. Check the continuity between the terminals. OK:

Continuity

If there is no continuity, connect the © test lead to terminal A7-4 and the ■ lead to terminal A7-5. Recheck continuity between the terminals.

cnn/M o

Repair or replace and check for open in harness and connector between DLC1 and ABS control relay and body ground (See page IN-26).

Check DTC on page DI-1 11.

Check for short in harness and connector between warning light and DLC1 and ECU (See page IN-26).

Check ABS control relay (See step 2).

Replace ABS control relay.

Repair or replace and check for short in harness and connector between DLC1 and ABS control relay (See page IN-26).

DI-141

DI-141

CIRCUIT DESCRIPTION

Connecting between terminals Tc and E1 of the DLC1 cause the ECU to display the DTC by flashing the ABS warning light.

WIRING DIAGRAM

Toyota Prius Ecu Diagram

INSPECTION PROCEDURE

CHECK:

(a) Turn the ignition switch ON.

(b) Measure the voltage between terminals Tc and E1 of the DLC1.

If ABS warning light does not blink even after Tc and E1 are connected, ECU may be defective.

2 Check for open and short in harness and connector between ABS ECU and DLC1, and DLC1 and body ground (See page IN-26 ).

Check and replace ABS ECU.

CIRCUIT DESCRIPTION

The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with the DTC check.

Connecting terminals Ts and E1 of the DLC1 in the engine compartment starts the check.

WIRING DIAGRAM

Abs Warning Light Circut

INSPECTION PROCEDURE

CHECK:

(a) Turn the ignition switch ON.

(b) Measure the voltage between terminals Ts and E1 of the DLC1.

If ABS warning light does not blink even after Ts and E1 are connected, ECU may be defective.

2 Check for open and short in harness and connector between ABS ECU and DLC1, and DLC1 and body ground (See page IN-26 ).

Check and replace ABS ECU.

Check for fluid leakage from actuator or hydraulic lines.

Image Abs Check Light Toyota Vitz
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Responses

  • laverne
    How to fix 2007 toyota sienna abs light / brake light on?
    7 years ago
  • Asphodel
    Where is terminal tc and dlc1 on tercel?
    7 years ago

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