Code No.15: Cruise Control Switch System

OPERATION

This circuit judges the signals of each switch ("ON/OFF", "CANCEL", "COAST/SET" and "ACC/RES") of the cruise control switch. The engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> detects the state of the cruise control switch by sensing the voltages shown below.

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 <M/T> or engine-A-M/T-ECU <Automated manual transmission> 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.

PROBABLE CAUSES

Damaged harness or connector.
Malfunction of the cruise control switch.
Malfunction of the clock spring.
Malfunction of the engine-ECU <M/T>.
Malfunction of the engine-A-M/T-ECU <Automated manual transmission>.

DIAGNOSIS PROCEDURE

STEP 1. Check the data list.

Using M.U.T.-III, check the data list (Refer to

- data list reference table).

Item 75: "CANCEL" switch
Item 86: "ON/OFF" switch
Item 91: "ACC/RES" switch
Item 92: "COAST/SET" 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 B-247.

(1)Remove the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring

(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 B-247 terminal No.3 and earth with cruise control switch connector B-247 connected.
OK: 4.7 - 5.0 V

Q. Is the check result normal?

Go to Step 10.

Go to Step 3.

STEP 3. Measure the voltage at engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1>.

(1)Remove the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> (Refer to GROUP 13B - Engine-ECU, Engine-A-M/T-ECU

) <135, 4A9> or (Refer to GROUP 13C - Engine-ECU

) <4G1>.

(2)Connect special tool power plant ECU check harness (MB991987) between the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> 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 66-pin connector terminal No.89 (engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1> terminal No.89) and earth.
OK: 4.7 - 5.0 V

Q. Is the check result normal?

Go to Step 6.

Go to Step 4.

STEP 4. Connector check: A-09 <135, 4A9> or A-35 <4G1> engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector.

Q. Is the check result normal?

Go to Step 5.

Repair or replace the damaged connector. Then go to Step 21.

STEP 5. Check the harness for short circuit to earth between engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1> terminal No.89 and the cruise control switch connector B-247 terminal No.3.

(1)Disconnect engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1> and measure at the harness connector side.
(2)Turn the ignition switch to the "LOCK" (OFF) position.
(3)Measure the continuity between engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1> terminal No.89 and earth.

Q. Is the measured continuity open circuit?

Go to Step 19.

Go to Step 6.

STEP 6. Connectors check: B-247 cruise control switch connector, C-242 and C-244 clock spring connectors and B-118 intermediate connector.

Q. Is the check result normal?

Go to Step 7.

Repair or replace the damaged connector. Then go to Step 21.

STEP 7. Check the harness wire between engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1> terminal No.89 and the clock spring connector B-242 terminal No.5, and between clock spring connector B-244 terminal No.2 and the cruise control switch connector B-247 terminal No.3.

Q. Is the check result normal?

Go to Step 8.

Repair the damaged harness wire. Then go to Step 21.

STEP 8. Check the clock spring.

Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring Inspection

Q. Is the check result normal?

	Go to Step 9.

	Replace the clock spring [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring ]. 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 75: "CANCEL" switch
Item 86: "ON/OFF" switch
Item 91: "ACC/RES" switch
Item 92: "COAST/SET" 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 ).

	Return to Step 2.

STEP 10. Measure the voltage at cruise control switch connector B-247.

(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 B-247 connected, and measure the terminal voltage between cruise control switch connector B-247 terminal No.2 and earth.
OK: 0.5 V or less

Q. Is the check result normal?

Go to Step 17.

Go to Step 11.

STEP 11. Measure the voltage at engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1>.

(1)Remove the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> (Refer to GROUP 13B - Engine-ECU, Engine-A-M/T-ECU

) <135, 4A9> or (Refer to GROUP 13C - Engine-ECU

) <4G1>.

(2)Connect special tool power plant ECU check harness (MB991987) between the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> 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 66-pin connector terminal No.114 (engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1> terminal No.89) and earth.
OK: 0.5 V or less

Q. Is the check result normal?

Go to Step 13.

Go to Step 12.

STEP 12. A-09 <135, 4A9> or A-35 <4G1> engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector

Q. Is the check result normal?

Go to Step 19.

Repair or replace the damaged connector. Then go to Step 21.

STEP 13. Connectors check: A-09 <135, 4A9> or A-35 <4G1> engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector, B-247 cruise control switch connector, C-242 and C-244 clock spring connectors and B-118 intermediate connector.

Q. Is the check result normal?

Go to Step 14.

Repair or replace the damaged connector. Then go to Step 21.

STEP 14. Check the harness wire between engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector A-09 <135, 4A9> or A-35 <4G1> terminal No.114 and the clock spring connector B-242 terminal No.4, and between clock spring connector B-244 terminal No.3 and the cruise control switch connector B-247 terminal No.2.

Q. Is the check result normal?

Go to Step 15.

Repair the damaged harness wire. Then go to Step 21.

STEP 15. Check the clock spring.

Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring Inspection

Q. Is the check result normal?

	Go to Step 16.

	Replace the clock spring [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring ]. 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 75: "CANCEL" switch
Item 86: "ON/OFF" switch
Item 91: "ACC/RES" switch
Item 92: "COAST/SET" 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 ).

	Return to Step 2.

STEP 17. Connector check: B-247 cruise control switch connector.

Q. Is the check result normal?

Go to Step 18.

Repair or replace the damaged connector. Then go to Step 21.

STEP 18. Check the cruise control switch.

Refer to

Q. Is the check result normal?

	Go to Step 19.

	Replace the cruise control switch (Refer to ). 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 75: "CANCEL" switch
Item 86: "ON/OFF" switch
Item 91: "ACC/RES" switch
Item 92: "COAST/SET" switch

Q. Is the check result normal?

	Go to Step 20.

Replace the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> (Refer to GROUP 13B - Engine-ECU, engine-A-M/T-ECU

) <135, 4A9> or (Refer to GROUP 13C - Engine-ECU

) <4G1>. When the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> is replaced, register the encrypted code (Refer to GROUP 54A - Ignition Switch, Encrypted Code Registration Criteria Table

). Then go to Step 21.

STEP 20. Read the diagnosis code.

(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.

(2)Connect the negative battery terminal.

(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn ON the cruise control indicator lamp).

(4)After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnosis code of the cruise control system (Refer to

Q. Is diagnosis code No.15 set?

Replace the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> (Refer to GROUP 13B - Engine-ECU, engine-A-M/T-ECU

) <135, 4A9> or (Refer to GROUP 13C - Engine-ECU

). 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 75: "CANCEL" switch
Item 86: "ON/OFF" switch
Item 91: "ACC/RES" switch
Item 92: "COAST/SET" switch

Q. Is the check result normal?

	Go to Step 22.

	Return to Step 2.

STEP 22. Read the diagnosis code.

(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.

(2)Connect the negative battery terminal.

(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn ON the cruise control indicator lamp).

(4)After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnosis code of the cruise control system (Refer to

Q. Is diagnosis code No.15 set?

	Return to Step 1.

	The procedure is complete.