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Home >> Toyota >> 2006 >> Sequoia Limited, RWD >> Repair and Diagnosis >> Suspension >> Suspension Control Systems >> Suspension Control System >> Air Suspension System >> Test Mode Procedure
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Test Mode Procedure

  1. INPUT SIGNAL CHECK (Using SST check wire) 

    HINT:

    • This function checks if signals from the stop light switch assembly and the door courtesy light switch, etc. are being input normally to the ECU.
    • When entering test mode, the suspension control ECU sets all the test mode DTCs first.

      After completing the test mode for each check item, the test mode DTCs that are determined normal by the suspension control ECU will be erased.

      The test mode DTCs for other check items may not be erased when only a certain signal is inspected.

    • When the test mode returns back to normal mode, all the test mode DTCs will be erased.
    1. Procedure for Input Signal Check Mode (Test Mode) using SST check wire.

      SST 09843-18040 

      1. Make sure the ignition switch is OFF.
      2. Set each of the check items to the condition shown under Operation (A) in the test mode table.
      3. Using SST, connect terminals TS and CG of the DLC3.
      4. Turn the ignition switch to the ON position.
        Fig 1: Identifying DL3C Connector Terminals
        G04509164Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      5. Check that the height control manual indicator light is blinking.

        HINT:

        • The height control manual indicator light comes on for 2 seconds, then blinks at 0.25 sec. intervals.
        • If the height control manual indicator light does not blink, inspect the height control manual indicator light circuit (See HEIGHT CONTROL INDICATOR LIGHT CIRCUIT  ).
        • The TS terminal circuit uses CAN (Controller Area Network) for communication. Therefore, if here are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system is/are output.
          Fig 2: Identifying Height Control Manual Indicator Light
          G04509165Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      6. Set each of the check items to the condition shown under Operation (B) in the test mode table below.

        HINT:

        When checking each item, the height control manual indicator light comes on for 1 second.

        Test mode table 

        TEST MODE TABLE

        Check Item Operation (A) Operation (B)
        Stop light switch signal OFF (Brake pedal not depressed) ON (Brake pedal depressed)
        Door courtesy light switch signal ON (Each door opened) OFF (All doors closed)
        Height control switch signal - Press the height control switch "UP" first and then press "DOWN"
        Height control mode select switch signal OFF (Height control mode select switch not pushed in) ON to OFF (Height control mode select switch pushed in and released)
      7. Using SST, connect the 3rd terminal of the SST check wire to terminal TC of the DLC3.

        SST 09843-18040 

        Fig 3: Identifying DL3C Connector Terminals
        G04509166Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      8. Read the number of blinks of the height control manual indicator light.

        HINT:

        • As examples, the blinking patterns of a normal system code and code 82 are shown in the illustration.
        • If 2 or more malfunctions are indicated at the same time, the lowest numbered code is displayed first.
        • When a DTC is not output, check the TC terminal circuit (See DIAGNOSIS CIRCUIT ).
      9. Check the malfunction using the code table on the next page.
        Fig 4: Identifying Height Control Manual Indicator Light
        G04509167Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
        Fig 5: Height Control Manual Indicator Light Blinking Pattern
        G04509168Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Ending the Input Signal Check Mode (Test Mode) using SST check wire.

      SST 09843-18040 

      1. With the ignition switch OFF, disconnect the SST check wire from the terminals of the DLC3 and then turn the ignition switch to the ON position.
    3. Procedure for Sensor Test Mode (Test Mode) using the intelligent tester.
      1. Make sure the ignition switch is OFF.
      2. Set each of the check items to the condition shown under Operation (A) in the test mode table on the previous page.
      3. Connect the intelligent tester to the DLC3.
      4. Turn the ignition switch to the ON position.
      5. Select SIGNAL CHECK mode on the intelligent tester.
      6. Set each of the check items to the condition shown under Operation (B) in the test mode table.

        HINT:

        In step (6), all signals can be checked together.

      7. Read the DTCs by following the prompts on the tester screen.

        HINT:

        Refer to the intelligent tester operators manual for further details.

    4. DTC of air suspension system test mode (input signal check) function:

      If a trouble code is displayed during the test mode DTC check, check the circuit listed for that code.

      DTC INDEX

      DTC No. Detection Item Trouble Area
      C1782/82 (See DTC C1782/82 STOP LIGHT SWITCH CIRCUIT  ) Stop light switch circuit malfunction
      • Stop light switch assembly
      • Stop light switch circuit
      • Suspension control ECU
      C1783/83 (See DTC C1783/83 DOOR COURTESY SWITCH CIRCUIT  ) Door courtesy switch circuit malfunction
      • Door courtesy light switch assembly
      • Back door lock assembly (Back door courtesy light switch)
      • Door courtesy light switch circuit
      • Body ECU
      • Back door ECU
      • Suspension control ECU
      C1786/86 (See DTC C1786/86 HEIGHT CONTROL SWITCH CIRCUIT  ) Height control switch circuit malfunction
      • Height control switch
      • Height control switch circuit
      • Suspension control ECU
      C1788/88 (See DTC C1788/88 HEIGHT CONTROL OFF SWITCH CIRCUIT  ) Height control mode select switch circuit malfunction
      • Height control mode select switch
      • Height control mode select switch circuit
      • Suspension control ECU
  2. INPUT SIGNAL CHECK (Using INTELLIGENT TESTER) 

    HINT:

    • This function checks if signals from the stop light switch assembly and the door courtesy light switch, etc. are being input normally to the ECU.
    • When entering test mode, the suspension control ECU sets all the test mode DTCs first.

      After completing the test mode for each check item, the test mode DTCs that are determined normal by the suspension control ECU will be erased.

      The test mode DTCs for other check items may not be erased when only a certain signal is inspected.

    • When the test mode returns back to normal mode, all the test mode DTCs will be erased.
    1. Procedure for Test Mode (Input signal check).
      1. Make sure that the ignition switch is off.
      2. Set each of the check items to the condition shown under Operation (A) in the test mode table.
      3. Connect the intelligent tester to the DLC3.
      4. Turn the ignition switch to the ON position.
      5. Select TEST MODE on the intelligent tester.
      6. Set each of the check items to the condition shown under Operation (B) in the test mode table below.
        Fig 6: Connecting Intelligent Tester To DLC3
        G04509169Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

        Test mode (input signal check) table 

        TEST MODE TABLE

        Check Item Operation (A) Operation (B)
        Stop light switch signal OFF (Brake pedal not depressed) ON (Brake pedal depressed)
        Door courtesy light switch signal ON (Each door opened) OFF (All doors closed)
        Height control switch signal - Press the height control switch "UP" first and then press "DOWN"
        Height control mode select switch signal OFF (Height control mode select switch not pushed in) ON to OFF (Height control mode select switch pushed in and released)

        HINT:

        In step (6), all signals can be checked together.

      7. Read the test mode DTCs by following the prompts on the tester screen.

        HINT:

        Refer to the intelligent tester operator's manual for further details.

      8. Check the malfunction using the code table below. After completing the test mode, disconnect the tester and turn the ignition switch off.
    2. DTC of air suspension system test mode (input signal check) function:

      If a trouble code is displayed during the test mode DTC check, check the circuit listed for that code. For details of each code, refer to "See page" under the respective DTC No. in the chart.

      DTC NO. DETECTION INDEX

      DTC No. Detection Item Trouble Area
      C1782/82 (See DTC C1782/82 STOP LIGHT SWITCH CIRCUIT  ) Stop light switch circuit malfunction
      • Stop light switch assembly
      • Stop light switch circuit
      • Suspension control ECU
      C1783/83 (See DTC C1783/83 DOOR COURTESY SWITCH CIRCUIT  ) Door courtesy switch circuit malfunction
      • Door courtesy light switch assembly
      • Back door lock assembly (Back door courtesy light switch)
      • Door courtesy light switch circuit
      • Main Body ECU
      • Back door ECU
      • Suspension control ECU
      C1786/86 (See DTC C1786/86 HEIGHT CONTROL SWITCH CIRCUIT  ) Height control switch circuit malfunction
      • Height control switch
      • Height control switch circuit
      • Suspension control ECU
      C1788/88 (See DTC C1788/88 HEIGHT CONTROL OFF SWITCH CIRCUIT  ) Height control mode select switch circuit malfunction
      • Height control mode select switch
      • Height control mode select switch circuit
      • Suspension control ECU
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