DTC 15: Auto-cruise Control Switch System: Diagnosis

Required Special Tool:

• MB991223: Harness Set

1. Check the 12-Volt supply circuit voltage at auto-cruise control switch connector C-82 (terminal number 1).
   1. Disconnect auto-cruise control switch connector C-82 and measure at the harness side.
   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 1 and ground.
      Fig 1: Measuring Voltage Between Terminal 1 And Ground

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   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the voltage approximately battery positive voltage?

   YES : Go to Step 6.

   NO : Go to Step 2.

2. Check auto-cruise control switch connector C-82.
   Fig 2: Checking Auto-Cruise Control Switch Connector C-82

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   Q: Is the connector damaged?

   YES : Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 15 is not output.

   NO : Go to Step 3.

3. Check the clock spring.

   Refer to AIR BAG RESTRAINT SYSTEMS .

   Q: Is the clock spring damaged?

   YES : Replace the clock spring. Refer to AIR BAG RESTRAINT SYSTEMS . Then check that diagnostic trouble code 15 is not output.

   NO : Go to Step 4.

4. Check clock spring connector C-84.
   Fig 3: Checking Clock Spring Connector C-84

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   Q: Is any connector damaged?

   YES : Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 15 is not output.

   NO : Go to Step 5.

5. Check clock spring connector C-96.
   Fig 4: Checking Clock Spring Connector C-96

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   Q: Is any connector damaged?

   YES : Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 15 is not output.

   NO : Check the harness wire between multi-purpose fuse No. 21 and auto-cruise control switch connector C-82 for open circuit or damage. Then repair if necessary. Then check that diagnostic trouble code 15 is not output.

6. Check the output circuit voltage at auto-cruise control switch connector C-82 (terminal numbers 2 and 3) by backprobing.
   1. Do not disconnect auto-cruise control switch connector C-207.
   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 2 and ground by backprobing.
      Fig 5: Measuring Voltage Between Terminal 2, 3 And Ground By Backprobing

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      • Voltage should be battery positive voltage. (MAIN switch is at the "ON" position.)
   4. Measure the voltage between terminal 3 and ground by backprobing.
      • Voltage should be between 6.8 and 7.2 volts. (MAIN switch is at the "ON" position.)
      • Voltage should be between 3.5 and 5.0 volts. (All switches are at the "OFF" position.)
      • Voltage should be between 0.4 and 2.3 volts. ("SET" switch is at the "ON" position)
      • Voltage should be between 2.3 and 3.5 volts. ("RESUME" switch is at the "ON" position.)
      • Voltage should be between 1 volt or less. ("CANCEL" switch is at the "ON" position.)
   5. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the voltage within specifications?

   YES : Go to Step 9.

   NO : Go to Step 7.

7. Check auto-cruise control switch connector C-82.
   Fig 6: Checking Auto-Cruise Control Switch Connector C-82

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   Q: Is the connector damaged?

   YES : Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 15 is not output.

   NO : Go to Step 8.

8. Check the auto-cruise control switch.
   1. Disconnect auto-cruise control switch. (Refer to AUTO-CRUISE CONTROL .)
   2. Measure the resistance between the terminals when each of the "SET," "RESUME," "CANCEL" and MAIN switch is pressed.

   Q: Is the values measured correspond to those in the Fig 7 andFig 8 below?

   YES : Check that diagnostic trouble code 15 is not output. If diagnostic trouble code 15 is output, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL .). Then check that diagnostic trouble code 15 is not output.

   NO : Replace the auto-cruise control switch. (Refer to AUTO-CRUISE CONTROL .). Then check that diagnostic trouble code 15 is not output.

   Fig 7: Checking Auto-Cruise Control Switch

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   Fig 8: Auto-Cruise Control Switch Resistance Chart

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9. Check the output circuit voltage at auto-cruise control-ECU connector C-20 (terminal numbers 9 and 12) by backprobing.
   1. Do not disconnect auto-cruise control-ECU connector C-20.
   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 12 and ground by backprobing.
      Fig 9: Measuring Voltage Between Terminal 12, 9 And Ground By Backprobing

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      • Voltage should be battery positive voltage. (The MAIN switch is at the "ON" position.)
   4. Measure the voltage between terminal 9 and ground by backprobing.
      • Voltage should be between 6.8 and 7.2 volts. (MAIN switch is at the "ON" position.)
      • Voltage should be between 3.5 and 5.0 volts. (All switches are at the "OFF" position.)
      • Voltage should be between 0.4 and 2.3 volts. ("SET" switch is at the "ON" position.)
      • Voltage should be between 2.3 and 3.5 volts. ("RESUME" switch is at the "ON" position.)
      • Voltage should be between 1 volt or less. ("CANCEL" switch is at the "ON" position.)
   5. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the voltage within specifications?

   YES : Check that diagnostic trouble code 15 is not output. If diagnostic trouble code 15 is output, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL .). Then check that diagnostic trouble code 15 is not output.

   NO : Go to Step 10.

10. Check auto-cruise control-ECU connector C-20.
    Fig 10: Locating Connector C-20

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    Q: Is the connector damaged?

    YES : Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 15 is not output.

    NO: Go to Step 11.

11. Check the clock spring.

    Refer to AIR BAG RESTRAINT SYSTEMS .

    Q: Is the clock spring damaged?

    YES : Replace the clock spring. Refer to AIR BAG RESTRAINT SYSTEMS . Then check that diagnostic trouble code 15 is not output.

    NO: Go to Step 12.

12. Check auto-cruise control switch connector C-82, clock spring connector C-84 and C-96.
    Fig 11: Checking Auto-Cruise Control Switch Connector C-82, Clock Spring Connector C-84 And C-96

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    Q: Is any connector damaged?

    YES : Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 15 is not output.

    NO: Go to Step 13.

13. Check the harness wire between auto-cruise control switch connector C-82 (terminal numbers 2 and 3) and auto-cruise control-ECU connector C-20 (terminal numbers 9 and 12).
    Fig 12: Checking Auto-Cruise Control-ECU Connector C-20

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    Fig 13: Locating Connector C-82

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    Q: Is any harness wire between auto-cruise control switch connector C-82 (terminal numbers 2 and 3) and auto-cruise control-ECU connector C-20 (terminal numbers 9 and 12) damaged?

    YES : Repair harness wire and then check that diagnostic trouble code 15 is not output.

    NO : Check that diagnostic trouble code 15 is not output. If diagnostic trouble code 15 is output, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL .). Then check that diagnostic trouble code 15 is not output.