[35B] ANTI-SKID BRAKING SYSTEM (ABS) - - TROUBLESHOOTING - DIAGNOSTIC TROUBLE CODE PROCEDURES - Code No. 33 : Stoplamp Switch SystemPRINT PAGE / INDEX / PRIOR / NEXT
Code No. 33 : Stoplamp Switch System
CIRCUIT OPERATION
The "ON" signal when the brake pedal is pressed or the "OFF" signal when the brake pedal is released is input to the ABS-ECU (terminal 3).
DIAGNOSIS CODE SET CONDITIONS
Diagnosis code No. 33 is output in the following cases:
  • Stoplamp switch is not operating properly and remains in ON state for more than 15 minutes.
  • Stoplamp switch system harness is damaged and no signal is input to ABS-ECU.
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR DIAGNOSIS CODE NO. 33 TO SET ARE:)
  • Malfunction of the stoplamp switch
  • Damaged wiring harness and connector
  • Malfunction of the hydraulic unit (integrated with ABS-ECU)
DIAGNOSIS
STEP 1. Check the stoplamp operation.
Q: Does the stoplamp come on and go out correctly?
YES:  Go to Step 4.
NO:  Go to Step 2.
STEP 2. Check the stoplamp switch installation condition.
Q: Is the stoplamp switch installed properly?
YES:  Go to Step 3.
NO:  Repair it and then go to Step 7.
STEP 3. Check the stoplamp switch continuity.
  1. Remove the stoplamp switch. (Refer to GROUP 35A, Brake Pedal .)
       
    1. Connect an ohmmeter to stoplight switch terminals 1 and 2, and check whether there is continuity when the plunger of the stoplamp switch is pushed in and when it is released.
    1. The stoplamp switch is in good condition if there is no continuity when the plunger is pushed in to a depth of within 4 mm from the outer case edge surface, and if there is continuity when it is released.
    Q: Is the stoplamp switch continuity incorrect?
    YES:  Replace it and then go to Step 7.
    NO:  Check the stoplamp circuit and repair and then go to Step 7.
    STEP 4. MUT-II/III data list.
    Set MUT-II/III to data reading mode, and check the data list item.
    • Item 33: Stoplamp switch
    OK:
    Brake pedal stepped down: ON
    Brake pedal released: OFF
    Q: Is the stoplamp switch input normal?
    YES:  This malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope With Intermittent Malfunction     .
    NO:  Go to Step 5.
    STEP 5. Measure the voltage at ABS-ECU connector B-03.
    1. Disconnect connector B-03 and measure at the harness side.
    1. Turn the stoplamp switch ON.
    1. Measure the voltage between terminal 3 and earth.
      2. OK: System voltage
    Q: Is the check result normal?
    YES:  Erase the diagnosis code memory, and recheck if any diagnosis code sets. If diagnosis code No. 33 set, replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 7    .
    NO:  Go to Step 6.
    STEP 6. Check the harness wire between ABS-ECU connector B-03 terminal 3 and stoplamp switch connector C-101 terminal 1.
    NOTE:  After inspecting intermediate connectors C-16, C-104 and stoplight switch connector C-101, inspect the wire. If intermediate connectors C-16, C-104 and stoplight switch connector C-101 are damaged, repair or replace them. Then go to Step 7.
    Q: Is the harness wire between ABS-ECU connector B-03 terminal 3 and stoplamp switch connector C-101 terminal 1 damaged?
    YES:  Repair it and then go to Step 7.
    NO:  Go to Step 7.
    STEP 7. Check whether the diagnosis code is reset.
    Q: Does diagnosis code No. 33 reset?
    YES:  Return to Step 1.
    NO:  The procedure is complete.
    [35B] ANTI-SKID BRAKING SYSTEM (ABS) - - TROUBLESHOOTING - DIAGNOSTIC TROUBLE CODE PROCEDURES - Code No. 33 : Stoplamp Switch SystemPRINT PAGE / INDEX / PRIOR / NEXT
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