Toyota Camry (XV70): Brake Warning Light (Yellow) Remains On
DESCRIPTION
This procedure is for troubleshooting when the brake warning light (yellow) remains on but no DTCs are output.
The skid control ECU (brake actuator assembly) controls the brake warning light (yellow) in the combination meter assembly via CAN communication.
PROCEDURE
| 1. |
CHECK VEHICLE CONTROL HISTORY (RoB) (ELECTRIC PARKING BRAKE SYSTEM) |
(a) Using the Techstream, check for Vehicle Control History (RoB).
Click here
Chassis > Brake > Utility|
Tester Display |
|---|
| Vehicle Control History (RoB) |
HINT:
If vehicle control history (RoB) is stored when the electric parking brake system is suspended, the brake warning light (yellow) illuminates.
|
Result | Proceed to |
|---|---|
|
There is no vehicle control history (RoB) for when the electric parking brake system was suspended. |
A |
| There is vehicle control history (RoB) for when the electric parking brake system was suspended. |
B |
| B |
.gif) | ERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY (RoB) NOTICE: After performing troubleshooting and repair regarding vehicle control history (RoB), clear the vehicle control history (RoB). |
|
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| 2. |
INSPECT COMBINATION METER ASSEMBLY (BRAKE WARNING LIGHT (YELLOW)) |
(a) Perform the Active Test of the combination meter assembly using the Techstream.
Click here
Body Electrical > Combination Meter > Active Test|
Tester Display |
|---|
| ECB Warning |
(b) Check the combination meter assembly.
OK:
The brake warning light (yellow) turns on or off in accordance with Techstream operation.
| OK | | REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
| NG | | INSPECT METER / GAUGE SYSTEM |
READ NEXT:
Electric Parking Brake System AUTO Function Circuit
DESCRIPTION The skid control ECU (brake actuator assembly) receives shift position signals from the ECM via CAN communication to control the electric parking brake system AUTO function (shift-linked f
Operation Method
OPERATION METHOD PROCEDURE 1. PRECAUTION
Click here 2. REMOVE REAR SEAT CUSHION ASSEMBLY
Click here
3. REMOVE REAR SEAT CUSHION LOCK HOOK
Click here
4. PARKING BRAKE FORCED RELEASE
SEE MORE:
On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE
1. INSPECT FUEL CUT OPERATION (a) Start the engine. (b) Warm up the engine.
(c) Increase the engine speed to approximately 3500 rpm. (d) Use a sound scope to check for fuel injector assembly operating sounds.
(e) When the accelerator pedal is fully released, che
Brake fluid
■ Checking fluid level
The brake fluid level should be
between the "MAX" and "MIN"
lines on the tank.
"MAX"
"MIN"
■ Adding fluid
Make sure to check the fluid type and prepare the necessary item.
■Brake fluid can absorb moisture from the air
Excess moisture in the brake fluid
