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Home >> Toyota >> 2003 >> Highlander Limited, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Combination Meter - Diagnostics >> Buzzer Does Not Sound (Parking Brake Warning, Key Unlock Warning, Open Door Warning) >> Inspection Procedure

Inspection Procedure

  1. CHECK BUZZER (PARKING BRAKE WARNING, KEY UNLOCK WARNING, OPEN DOOR WARNING) 
    1. Check that the all of the warning buzzers sound.
      1. All buzzers do not sound, proceed to A.
      2. Open door warning buzzer does not sound, proceed to B.
      3. Key unlock warning buzzer does not sound, proceed to C.
      4. Parking brake warning does not sound, proceed to D.
    1. A: CHECK AND REPLACE COMBINATION METER ASSEMBLY 
    2. B: GO TO NEXT STEP 
    3. C: GO TO STEP   6 
    4. D: GO TO STEP   10 
  2. INSPECT MULTIPLEX NETWORK BODY ECU 
    1. Remove the body ECU with connectors with still connected.
    2. Measure voltage between terminal DCTY (B11-11) of body ECU and body ground.

      Standard: 

    MULTIPLEX NETWORK BODY ECU SPECIFICATIONS

    Condition Voltage
    Ignition Key Inserted Below 1.0V
    Ignition Key Not Inserted 10 - 14V
    Fig 1: Identifying Body ECU Connector Terminals
    G02828496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: GO TO STEP   5 
    2. NG: GO TO NEXT STEP 
  3. INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSEMBLY  See INSPECTION .
    1. NG: REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSEMBLY 
    2. OK: GO TO NEXT STEP 
  4. REPAIR HARNESS AND CONNECTOR (BETWEEN BODY ECU AND FRONT DOOR COURTESY LAMP SWITCH) 
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE MULTIPLEX NETWORK BODY ECU 
  5. CHECK THAT MALFUNCTION DISAPPEARS WHEN A KNOWN GOOD COMBINATION METER IS INSTALLED 
    1. Check that malfunction disappears when a known good combination meter is installed.
      1. Malfunction does not disappear, proceed to A.
      2. Malfunction disappears, proceed to B.
    1. A: CHECK AND REPLACE MULTIPLEX NETWORK BODY ECU 
    2. B: CHECK AND REPLACE COMBINATION METER ASSEMBLY 
  6. READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER 
    1. Check output value of key unlock warning switch.
      1. Connect the OBD II scan tool or hand-held tester to DLC3.
      2. Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON.
      3. Select the DATA LIST mode on the OBD II scan tool or hand-held tester.
      4. Check the key unlock warning switch condition.
    1. OK: GO TO STEP   9 
    2. NG: GO TO NEXT STEP 
  7. INSPECT UN-LOCK WARNING SWITCH ASSEMBLY  See UNLOCK WARNING SWITCH CIRCUIT .
    1. NG: REPLACE UN-LOCK WARNING SWITCH ASSEMBLY 
    2. OK: GO TO NEXT STEP 
  8. CHECK HARNESS AND CONNECTOR (BETWEEN BODY ECU AND KEY UNLOCK WARNING SWITCH) 
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE MULTIPLEX NETWORK BODY ECU 
  9. CHECK THAT MALFUNCTION DISAPPEARS WHEN A KNOWN GOOD COMBINATION METER IS INSTALLED 
    1. Check that malfunction disappears when a known good combination meter is installed.
      1. Malfunction does not disappear, proceed to A.
      2. Malfunction disappears, proceed to B.
    1. A: CHECK AND REPLACE MULTIPLEX NETWORK BODY ECU 
    2. B: CHECK AND REPLACE COMBINATION METER ASSEMBLY 
  10. READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER 
    1. Check output value of parking brake switch.
      1. Connect the OBD II scan tool or hand-held tester to DLC3.
      2. Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON.
      3. Select the DATA LIST mode on the OBD II scan tool or hand-held tester.
      4. Check the parking brake switch condition.
    1. OK: GO TO STEP   13 
    2. NG: GO TO NEXT STEP 
  11. INSPECT PARKING BRAKE SWITCH ASSEMBLY 
    1. Inspect the continuity exists between terminals of parking brake.

      Switch pin released: Continuity 

      Switch pin pushed in: No continuity 

    1. NG: REPLACE PARKING BRAKE SWITCH ASSEMBLY 
    2. OK: GO TO NEXT STEP 
  12. CHECK HARNESS AND CONNECTOR 
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP 
  13. CHECK THAT MALFUNCTION DISAPPEARS WHEN A KNOWN GOOD COMBINATION METER IS INSTALLED 
    1. Check that malfunction disappears when a known good combination meter is installed.
      1. Malfunction does not disappear, proceed to A.
      2. Malfunction disappears, proceed to B.
    1. A: CHECK AND REPLACE MULTIPLEX NETWORK BODY ECU 
    2. B: CHECK AND REPLACE COMBINATION METER ASSEMBLY 
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