INSPECTION PROCEDURE 1: When the ignition switch is turned ON position
(engine stopped), the brake warning lamp does not illuminate.
OPERATION
- The brake warning light power is supplied from the ignition switch (IG1).
The ASTC-ECU earths the circuit to illuminate the brake warning
light.
- The ASTC-ECU illuminates the brake warning light for 3 seconds while
running its self-check. The brake warning light can be illuminated for 3
seconds upon start-up or with the ignition switch in the "ON" position, and
the engine stopped.
COMMENT ON TROUBLE SYMPTOM
The cause is probably an open circuit
at the brake warning light circuit, or malfunction of the ASTC-ECU.
PROBABLE CAUSES
- Damaged wiring harness or connector
- Blown fuse
- Malfunction of the combination meter
- Malfunction of the ASTC-ECU
|
|
STEP 1. Check whether the brake warning light
illuminates.
|
|
|
Q.
Does the brake warning light illuminate at the condition that the ignition
switch is turned to the "ON" position and the engine is stopped.
|
|
|
 Go to Step 2.
|
|
|
|
|
|
 Go to Step 6.
|
|
|
|
|
|
STEP 2. Check the brake warning light circuit at ASTC-ECU connector
D-223.
|
|
|
(1)Disconnect ASTC-ECU connector D-223.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Check whether the brake warning light is
illuminated.
OK: illuminate
|
|
|
Q.
Does the brake warning light illuminate?
|
|
|
Replace the ASTC-ECU (Refer to
GROUP 35C, ASTC-ECU  ). Then go to Step 9.
|
|
|
|
|
|
Go to Step 3.
|
|
|
|
|
|
STEP 3. Check combination meter connector D-02 and ASTC-ECU connector
D-223 for loose, corroded or damaged terminals, or terminals pushed back
in the connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 4.
|
|
|
|
|
|
Repair the faulty connector or
terminal. Then go to Step 11.
|
|
|
|
|
|
STEP 4. Check intermediate connector D-230 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Repair it. Then go to Step
11.
|
|
|
|
|
|
STEP 5. Check the harness wires between combination meter connector
D-02 (terminal 45) and ASTC-ECU connector D-223 (terminal
81).
|
|
|
Q.
Is the check result normal?
|
|
|
Replace the combination meter
(Refer to GROUP 54A, Combination Meter Assembly ). Then go to Step 11.
|
|
|
|
|
|
Repair it. Then go to Step
11.
|
|
|
|
|
|
STEP 6. Check the combination meter power supply circuit at combination
meter harness connector D-02.
|
|
|
(1)Disconnect combination meter connector D-02, and measure
at the harness connector (component side).
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Measure the voltage between terminal 42 and body
earth.
OK: Approx. 12 volts (battery positive
voltage)
|
|
|
Q.
Is battery positive voltage (approx. 12 volts) present?
|
|
|
Replace the combination meter
(Refer to GROUP 54A, Combination Meter Assembly ). Then go to Step 11.
|
|
|
|
|
|
Go to Step 7.
|
|
|
|
|
|
STEP 7. Check combination meter connector D-02 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 8.
|
|
|
|
|
|
Repair the faulty connector or
terminal. Then go to Step 11.
|
|
|
|
|
|
STEP 8. Check intermediate connector D-405 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 9.
|
|
|
|
|
|
Repair it. Then go to Step
11.
|
|
|
|
|
|
STEP 9. Check the harness wires between junction block connector D-403
(terminal 6) and combination meter connector D-02 (terminal
42).
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 10.
|
|
|
|
|
|
Repair it. Then go to Step
11.
|
|
|
|
|
|
STEP 10. Check the harness wires between combination meter connector
D-02 (terminal 41, 52) and body earth.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 11.
|
|
|
|
|
|
Repair it. Then go to Step
11.
|
|
|
|
|
|
STEP 11. Retest the system.
|
|
|
Q.
Does the brake warning light illuminate for three seconds when the
ignition switch is turned to the "ON" position with engine
stopped?
|
|
|
The
procedure is complete.
|
|
|
|
|
|
Start over at Step 1.
|
|
|
|