Code No.33: Stop
lamp switch system
OPERATION
- The stop lamp switch turns ON when the brake pedal is depressed, and
turns
OFF when released.
- The ABS-ECU detects ON/OFF of the stop lamp switch based on the
voltage
change (ON: battery voltage, OFF: approx. 0 V), and determines if the brake
pedal is depressed
or not.
DIAGNOSIS CODE SET CONDITION
- When both the ABS and EBD are not controlled with the vehicle speed 15
km/h
or more, the stop lamp switch stays ON for 15 minutes or more.
- When the wiring harness of stop lamp switch input circuit is
open.
PROBABLE CAUSES
The most likely causes for these diagnosis codes
to set are:
- Malfunction of the stop lamp switch
- Incorrect adjustment of the stop lamp switch
- Damaged wiring harness and connector
- Malfunction of ABS-ECU
|
|
STEP 1. Operation check of stop lamp
|
|
|
(1)Turn the ignition switch to the "ON" position.
|
|
|
(2)Check the operation of the stop lamp when the brake pedal
is operated.
OK:
Brake pedal depressed: ON
Brake pedal released: OFF
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 3.
|
|
|
|
|
|
 Go to Step 2.
|
|
|
|
|
|
STEP 2. Check of stop lamp switch
|
|
|
Refer to GROUP 35A, Brake Pedal Inspection  .
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 3.
|
|
|
|
|
|
Replace it. Then go to Step
7.
|
|
|
|
|
|
STEP 3. M.U.T.-III data list.
|
|
|
Set M.U.T.-III to data reading mode, and check
the data list item.
|
|
|
- Item 33: Stop lamp switch
|
|
|
OK:
Brake pedal
stepped down: ON
Brake pedal released: OFF
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Go to Step 4.
|
|
|
|
|
|
STEP 4. Check of stop lamp switch
|
|
|
Refer to GROUP 35A, Brake pedal Inspection .
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Replace it. Then go to Step
7.
|
|
|
|
|
|
STEP 5. Voltage measurement at stop lamp switch connector
D-134.
|
|
|
| note |
Prior to the voltage inspection, check the stop
lamp switch connector D-134, multi-purpose
fuse No. 16, and intermediate connector D-241, and repair if
necessary.
|
|
|
|
(1)Disconnect the connector D-134.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Measure the voltage between terminal 2 and
earth.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 6.
|
|
|
|
|
|
Repair
the wiring harness between the stop lamp switch connector D-134 terminal
No. 2 and the battery.
|
|
|
|
|
|
STEP 6. Voltage measurement at ABS-ECU connector D-250.
|
|
|
| note |
Prior to the voltage inspection, check the ABS-ECU
connector D-250, stop lamp switch connector
D-134, junction connector D-113 (3200), and intermediate connector
D-230, and repair if necessary.
|
|
|
|
(1)Disconnect the connector D-250.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Measure the voltage between terminal 34 and
earth.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Repair
the wiring harness between the stop lamp switch connector D-134 terminal
No. 1 and the ABS-ECU connector D-250 terminal No. 34.
|
|
|
|
|
|
STEP 7. Check whether the diagnosis code is reset.
|
|
|
Check again if the diagnosis code is
set.
|
|
|
(1)Turn the ignition switch to the "ON" position.
|
|
|
(2)Erase the diagnosis code.
|
|
|
(3)Turn the ignition switch to the "LOCK" (OFF)
position.
|
|
|
(4)Turn the ignition switch to the "ON" position.
|
|
|
(5)Check if the diagnosis code is reset.
|
|
|
(6)Turn the ignition switch to the "LOCK" (OFF)
position.
|
|
|
Replace the ABS-ECU.
|
|
|
|
|
|
It can
be assumed that this malfunction is intermittent. Refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points - How to Cope
with Intermittent
Malfunction .
|
|
|
|