Code No.33: Stop Lamp Switch System
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If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Diagnose the CAN bus lines before the
diagnosis codes (Refer to GROUP 54D, CAN bus-line diagnostic flow  ).
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OPERATION
ASTC-ECU monitors whether the stop lamp switch is "ON"
or "OFF."
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be set if
the stop lamp switch "ON" continuously for 15 minutes or more.
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
- Blown stop lamp bulb
- Improper modification of the stop lamp
- Damaged wiring harness or connector
- Malfunction of the ASTC-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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(1)Connect M.U.T.-III to the 16-pin diagnosis
connector.
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(2)Turn the ignition switch to the "ON" position.
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(3)Diagnose the CAN bus line.
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(4)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line (Refer to
GROUP 54D, CAN bus line Diagnostic flow ). Then go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF)
position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Disconnect the M.U.T.-III.
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(6)Drive the vehicle more than 15 minutes at the speed
exceeds 15 km/h to judge the stop lamp switch to the
ASTC-ECU.
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(7)Check if the diagnosis code is set.
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(8)Turn the ignition switch to the "LOCK" (OFF)
position.
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Go to Step 3.
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The
procedure is complete.
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STEP 3. Operation check of stop lamp
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(1)Turn the ignition switch to the "ON" position.
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(2)Check the operation of the stop lamp when the brake pedal
is operated.
OK:
Brake pedal depressed: ON
Brake pedal released: OFF
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check of stop lamp switch
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Refer to GROUP 35A, Brake pedal Inspection .
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Q.
Is the check result normal?
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Go to Step 6.
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Replace it. Then go to Step
8.
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STEP 5. Voltage measurement at ASTC-ECU connector D-233.
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(1)Disconnect the connector D-233.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal 19 and
earth.
OK:
Brake pedal depressed: System
voltage
Brake pedal released: 1 V or less
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check ASTC-ECU connector D-233, stop lamp switch connector
D-134, junction connector D-113 (Vehicles 3200) and intermediate connector
D-230 for loose, corroded or damaged terminals, or terminals pushed back
in the connector.
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Q.
Is the check result normal?
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An open or short circuit may be
present between the stop lamp switch and ASTC-ECU. Repair the wiring
harness between ASTC-ECU connector D-233 terminal 19 and stop lamp switch
connector D-134. Then go to Step 8.
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Repair or replace the damaged
component(s). Then go to Step 8.
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STEP 7. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is
set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF)
position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Disconnect the M.U.T.-III.
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(6)Drive the vehicle more than 15 minutes at the speed
exceeds 15 km/h to judge the stop lamp switch to the
ASTC-ECU.
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(7)Check if the diagnosis code is reset.
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(8)Turn the ignition switch to the "LOCK" (OFF)
position.
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Replace the ASTC-ECU. Then go to
Step 8.
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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 .
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STEP 8. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF)
position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Disconnect the M.U.T.-III.
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(6)Drive the vehicle more than 15 minutes at the speed
exceeds 15 km/h to judge the stop lamp switch to the
ASTC-ECU.
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(7)Check if the diagnosis code is set.
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(8)Turn the ignition switch to the "LOCK" (OFF)
position.
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Repeat the troubleshooting from
Step 1.
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The
procedure is complete.
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