Code No.P0578: Cruise Control Switch Stuck
Code No.P0579: Cruise Control Switch Range
Code No.P0580: Cruise Control Switch Low
Code No.P0581: Cruise Control Switch High
Code No.P0591, P0592, P0593: Cruise Control Component Driver Key Signal 2










OPERATION




  • When all switches are OFF: 4.7 - 5.0 volts
  • When the "ON/OFF" switch is ON: 0 - 0.5 volt
  • When the "CANCEL" switch is ON: 1.0 - 1.8 volts
  • When the "COAST/SET" switch is ON: 2.3 - 3.0 volts
  • When the "ACC/RES" switch is ON: 3.5 - 4.2 volts

DIAGNOSIS CODE SET CONDITIONS



  • If the cruise control switch is operated, this diagnosis code will be set when the engine-ECU terminal voltage is different from the standard value.
  • Or, this code is set when the "COAST/SET" switch or "ACC/RES" switch is stuck to ON.

POSSIBLE CAUSES



  • Damaged harness or connector.
  • Malfunction of the cruise control switch.
  • Malfunction of the clock spring.
  • Malfunction of the engine-ECU.

DIAGNOSIS

STEP 1. Check the data list.
Using M.U.T.-III, check the data list (Refer to - data list reference table).

  • Item 285: Cruise control switch

Q. Is the check result normal?
Go to Step 20.
Go to Step 2.

STEP 2. Measure the voltage at cruise control switch connector C-203.
(1)Remove the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ).
(2)Remove the cruise control switch from the steering wheel with the cruise control switch connector connected (Refer to ).
(3)Connect the negative battery cable that was disconnected when the driver’s air bag module was removed.
(4)Turn the ignition switch to the "ON" position.
(5)Do not operate the cruise control switch.
(6)Measure the terminal voltage between cruise control switch connector C-203 terminal No.3 and earth with cruise control switch connector C-203 connected.
OK: 4.7 - 5.0 V
(7)Turn the ignition switch to the "LOCK" (OFF) position.
(8)Install the cruise control switch to the steering wheel (Refer to ).

Q. Is the check result normal?
Go to Step 10.
Go to Step 3.

STEP 3. Measure the terminal voltage at engine-ECU connector B-27.
(1)Remove the engine-ECU (Refer to GROUP 13D - Engine-ECU ).
(2)Connect special tool power plant ECU check harness (MB992044) between the engine-ECU and the body-side harness connector.
(3)Turn the ignition switch to the "ON" position.
(4)Do not operate the cruise control switch.
(5)Measure the terminal voltage between special tool 60-pin connector terminal No.52 (engine-ECU connector B-27 terminal No.52) and earth.
OK: 4.7 - 5.0 V
(6)Turn the ignition switch to the "LOCK" (OFF) position.
(7)Disconnect special tool MB992044 between the engine-ECU and the body-side harness connector.
(8)Install the engine-ECU (Refer to GROUP 13D - Engine-ECU ).

Q. Is the check result normal?
Go to Step 6.
Go to Step 4.

STEP 4. Connector check: B-27 engine-ECU connector.

Q. Is the check result normal?
Go to Step 5.
Repair or replace the damaged connector. Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 5. Check the harness for short circuit to earth between engine-ECU connector B-27 terminal No.52 and the cruise control switch connector C-203 terminal No.3.
(1)Disconnect engine-ECU connector B-27 and measure at the harness connector side.
(2)Turn the ignition switch to the "LOCK" (OFF) position.
(3)Measure the continuity between engine-ECU connector B-27 terminal No.52 and earth.
(4)Connect engine-ECU connector B-27.

Q. Is the measured continuity open circuit?
Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 19.
Go to Step 6.

STEP 6. Connectors check: C-203 cruise control switch connector, C-204 and C-205 clock spring connectors, A-11 and C-127 intermediate connectors.

Q. Is the check result normal?
Go to Step 7.
Repair or replace the damaged connector. Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 7. Check the harness wire between engine-ECU connector B-27 terminal No.52 and the cruise control switch connector C-203 terminal No.3.

Q. Is the check result normal?
Go to Step 8.
Repair the damaged harness wire. Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 8. Check the clock spring.
Refer to GROUP 52B - Driver’s Air Bag Module Inspection <Except for RALLIART> .

Q. Is the check result normal?
Go to Step 9.
Replace the clock spring and install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 9. Check the data list.
Using M.U.T.-III, check the data list (Refer to - data list reference table).

  • Item 285: Cruise control switch

Q. Is the check result normal?
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 ). Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ).
Return to Step 2.

STEP 10. Measure the voltage at cruise control switch connector C-203.
(1)Remove the cruise control switch from the steering wheel with the cruise control switch connector connected (Refer to ).
(2)Turn the ignition switch to the "ON" position.
(3)Press the "ON/OFF" switch with cruise control switch connector C-203 connected, and measure the terminal voltage between cruise control switch connector C-203 terminal No.2 and earth.
OK: 0.5 V or less
(4)Release the "ON/OFF" switch.
(5)Turn the ignition switch to the "LOCK" (OFF) position.
(6)Install the cruise control switch to the steering wheel (Refer to ).

Q. Is the check result normal?
Go to Step 17.
Go to Step 11.

STEP 11. Measure the terminal voltage at engine-ECU connector B-28.
(1)Remove the engine-ECU (Refer to GROUP 13D - Engine-ECU ).
(2)Connect special tool power plant ECU check harness (MB992044) between the engine-ECU and the body-side harness connector.
(3)Turn the ignition switch to the "ON" position.
(4)Press the "ON/OFF" switch, and measure the voltage between special tool 94-pin connector terminal No.128 (engine-ECU connector B-28 terminal No.128) and earth.
OK: 0.5 V or less
(5)Release the "ON/OFF" switch.
(6)Turn the ignition switch to the "LOCK" (OFF) position.
(7)Disconnect special tool MB992044 between the engine-ECU and the body-side harness connector.
(8)Install the engine-ECU (Refer to GROUP 13D - Engine-ECU ).

Q. Is the check result normal?
Go to Step 13.
Go to Step 12.

STEP 12. Connector check: B-28 engine-ECU connector.

Q. Is the check result normal?
Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 19.
Repair or replace the damaged connector. Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 13. Connectors check: B-28 engine-ECU connector, C-203 cruise control switch connector, C-204 and C-205 clock spring connectors, A-11 and C-127 intermediate connectors.

Q. Is the check result normal?
Go to Step 14.
Repair or replace the damaged connector. Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 14. Check the harness wire between engine-ECU connector B-28 terminal No.128 and the cruise control switch connector C-203 terminal No.2.

Q. Is the check result normal?
Go to Step 15.
Repair the damaged harness wire. Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 15. Check the clock spring.
Refer to GROUP 52B - Driver’s Air Bag Module Inspection <Except for RALLIART> .

Q. Is the check result normal?
Go to Step 16.
Replace the clock spring and install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 16. Check the data list.
Using M.U.T.-III, check the data list (Refer to - data list reference table).

  • Item 285: Cruise control switch

Q. Is the check result normal?
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 ). Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ).
Return to Step 2.

STEP 17. Connector check: C-203 cruise control switch connector.

Q. Is the check result normal?
Go to Step 18.
Repair or replace the damaged connector. Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 18. Check the cruise control switch.
Refer to .

Q. Is the check result normal?
Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 19.
Replace the cruise control switch (Refer to ). Install the driver’s air bag module (Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring <Except for RALLIART> ). Then go to Step 21.

STEP 19. Check the data list.
Using M.U.T.-III, check the data list (Refer to - data list reference table).

  • Item 285: Cruise control switch

Q. Is the check result normal?
Go to Step 20.
Replace the engine-ECU (Refer to GROUP 13D - Engine-ECU ). When the Engine-ECU is replaced, register the encrypted code (Refer to GROUP 42C - Troubleshooting, ID Code Registration Necessity Judgment Table ). Then go to Step 21.

STEP 20. Read the diagnosis code.
Using M.U.T.-III, read the diagnosis code of the cruise control system (Refer to ).

Q. Is diagnosis code No.P0578, P0579, P0580, P0581, P0591, P0592 or P0593 set?
Replace the engine-ECU (Refer to GROUP 13D - Engine-ECU ). When the Engine-ECU is replaced, register the encrypted code (Refer to GROUP 42C - Troubleshooting, ID Code Registration Necessity Judgment Table ). Then go to Step 21.
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 ).

STEP 21. Check the data list.
Using M.U.T.-III, check the data list (Refer to - data list reference table).

  • Item 285: Cruise control switch

Q. Is the check result normal?
Go to Step 22.
Return to Step 2.

STEP 22. Read the diagnosis code.
Using M.U.T.-III, read the diagnosis code of the cruise control system (Refer to ).

Q. Is diagnosis code No. P0578, P0579, P0580, P0581, P0591, P0592 or P0593 set?
Return to Step 1.
The procedure is complete.