Code No.15 Auto-cruise Control Switch System

OPERATION

This circuit judges the signals of each switch (SET, RESUME and CANCEL) of the auto-cruise control switch. The engine-A/T-ECU detects the state of the auto-cruise control switch by sensing the voltages shown below.

When all switches are OFF: 4.7 - 5.0 volts

When the MAIN switch is ON: 0 - 0.3 volt

When the SET switch is ON: 2.0 - 2.8 volts

When the RESUME switch is ON: 3.3 - 4.1 volts

When the CANCEL switch is ON: 0.8 - 1.5 volts

DIAGNOSIS CODE SET CONDITIONS

If the auto-cruise control switch is operated, this diagnosis code will be set when the engine-A/T-ECU terminal voltage is different from the standard value.

PROBABLE CAUSES

Malfunction of the auto-cruise control switch.

Malfunction of the clock spring.

Damaged harness or connector.

Malfunction of the engine-A/T-ECU.

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III data list

Item 01: Main switch (Refer to data list reference table ).

Item 02: Set switch (Refer to data list reference table ).

Item 03: Resume switch (Refer to data list reference table ).

Item 04: Cancel switch (Refer to data list reference table ).

Q: Is the check result normal?

YES: Go to Step 17

.
NO: Go to Step 2

STEP 2. Measure the voltage at auto-cruise control switch connector C-301.

Remove the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ).

Connect the negative (-) battery cable.

Turn the ignition switch to the "ON" position and the MAIN switch to the "OFF" position.

Measure the voltage between connector C-301 terminal No.2 and earth.

OK: 4.7-5.0 V

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

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Go to Step 3

STEP 3. Measure the voltage at engine-A/T-ECU connector C-137.

Turn the ignition switch to the "ON" position and the MAIN switch to the "OFF" position.

Measure the voltage between engine-A/T-ECU connector C-137 terminal No.94 and earth.

OK: 4.7-5.0 V

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

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Go to Step 4

STEP 4. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 5

.
NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 5. Check the harness between engine-A/T-ECU connector C-137 terminal No.94 and the auto-cruise control switch connector C-301 terminal No.2.

Disconnect engine-A/T-ECU connector C-137 and measure at the harness connector side.

Turn the ignition switch to the "ON" position and the MAIN switch to the "OFF" position.

Measure the continuity between engine-A/T-ECU connector C-137 terminal No.94 and earth.

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

Connect engine-A/T-ECU connector C-137.

Q: Is the measured continuity open circuit?

YES: Install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 17

.
NO: Go to Step 6

STEP 6. Connectors check: C-301 auto-cruise control switch connector, C-106 and C-302 intermediate connectors, C-308 and C-309 clock spring connectors

Q: Is the check result normal?

YES: Go to Step 7

.
NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 7. Check the harness between engine-A/T-ECU connector C-137 terminal No.94 and the auto-cruise control switch connector C-301 terminal No.2.

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Repair the damaged harness wire, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 8. Check the clock spring.

Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

Q: Is the check result normal?

YES: It can be assumed that this malfunction is intermittent, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

.
NO: Replace the clock spring and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 9. Measure the voltage at auto-cruise control switch connector C-301.

Turn the ignition switch to the "ON" position and the MAIN switch to the "ON" position.

Measure the voltage between connector C-301 terminal No.3 and earth.

OK: 0.5 V or less

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

Q: Is the check result normal?

YES: Go to Step 15

.
NO: Go to Step 10

STEP 10. Measure the voltage at engine-A/T-ECU connector C-138.

Turn the ignition switch to the "ON" position and the MAIN switch to the "ON" position.

Measure the voltage between engine-A/T-ECU connector C-138 terminal No.146 and earth.

OK: 0.5 V or less

Turn the MAIN switch to the "OFF" position and the ignition switch to the "OFF" position.

Q: Is the check result normal?

YES: Go to Step 12

.
NO: Go to Step 11

STEP 11. Connector check: C-138 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 17

.
NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 12. Connectors check: C-138 engine-A/T-ECU connector, C-106 and C-302 intermediate connector, C-301 auto-cruise control switch connector, C-308 and C-309 clock spring connectors

Q: Is the check result normal?

YES: Go to Step 13

.
NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 13. Check the harness between engine-A/T-ECU connector C-138 terminal No.146 and the auto-cruise control switch connector C-301 terminal No.3.

Q: Is the check result normal?

YES: Go to Step 14

.
NO: Repair the damaged harness wire, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 14. Check the clock spring.

Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

Q: Is the check result normal?

YES: It can be assumed that this malfunction is intermittent, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

.
NO: Replace the clock spring and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 15. Connector check: C-301 auto-cruise control switch connector

Q: Is the check result normal?

YES: Go to Step 16

.
NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 16. Check the auto-cruise control switch.

Refer to

Q: Is the check result normal?

YES: Install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 17

.
NO: Replace the auto-cruise control switch (Refer to

), and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring

). Then go to Step 18

STEP 17. Check the MUT-II/III diagnosis code No.15.

Q: Is the MUT-II/IIIdiagnosis code No.15 set?

YES: Replace the engine-A/T-ECU (Refer to GROUP 13C, Engine-A/T-ECU

). Then go to Step 18

.
NO: It can be assumed that this malfunction is intermittent.

STEP 18. Check the MUT-II/III diagnosis code No.15.

Q: Is the MUT-II/III diagnosis code No.15 set?

YES: Return to Step 1

.
NO: The procedure is complete.


Code No.15 Auto-cruise Control Switch System

OPERATION This circuit judges the signals of each switch (SET, RESUME and CANCEL) of the auto-cruise control switch. The engine-A/T-ECU detects the state of the auto-cruise control switch by sensing the voltages shown below. When all switches are OFF: 4.7 - 5.0 volts When the MAIN switch is ON: 0 - 0.3 volt When the SET switch is ON: 2.0 - 2.8 volts When the RESUME switch is ON: 3.3 - 4.1 volts When the CANCEL switch is ON: 0.8 - 1.5 volts
DIAGNOSIS CODE SET CONDITIONS If the auto-cruise control switch is operated, this diagnosis code will be set when the engine-A/T-ECU terminal voltage is different from the standard value.
PROBABLE CAUSES Malfunction of the auto-cruise control switch. Malfunction of the clock spring. Damaged harness or connector. Malfunction of the engine-A/T-ECU.
DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III data list Item 01: Main switch (Refer to data list reference table ). Item 02: Set switch (Refer to data list reference table ). Item 03: Resume switch (Refer to data list reference table ). Item 04: Cancel switch (Refer to data list reference table ). Q: Is the check result normal? YES: Go to Step 17. NO: Go to Step 2.
STEP 2. Measure the voltage at auto-cruise control switch connector C-301. Remove the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Connect the negative (-) battery cable. Turn the ignition switch to the "ON" position and the MAIN switch to the "OFF" position. Measure the voltage between connector C-301 terminal No.2 and earth. OK: 4.7-5.0 V Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the check result normal? YES: Go to Step 9. NO: Go to Step 3.
STEP 3. Measure the voltage at engine-A/T-ECU connector C-137. Turn the ignition switch to the "ON" position and the MAIN switch to the "OFF" position. Measure the voltage between engine-A/T-ECU connector C-137 terminal No.94 and earth. OK: 4.7-5.0 V Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the check result normal? YES: Go to Step 6 . NO: Go to Step 4.
STEP 4. Connector check: C-137 engine-A/T-ECU connector Q: Is the check result normal? YES: Go to Step 5 . NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 5. Check the harness between engine-A/T-ECU connector C-137 terminal No.94 and the auto-cruise control switch connector C-301 terminal No.2. Disconnect engine-A/T-ECU connector C-137 and measure at the harness connector side. Turn the ignition switch to the "ON" position and the MAIN switch to the "OFF" position. Measure the continuity between engine-A/T-ECU connector C-137 terminal No.94 and earth. Turn the ignition switch to the "LOCK" (OFF) position. Connect engine-A/T-ECU connector C-137. Q: Is the measured continuity open circuit? YES: Install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 17. NO: Go to Step 6.
STEP 6. Connectors check: C-301 auto-cruise control switch connector, C-106 and C-302 intermediate connectors, C-308 and C-309 clock spring connectors Q: Is the check result normal? YES: Go to Step 7 . NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 7. Check the harness between engine-A/T-ECU connector C-137 terminal No.94 and the auto-cruise control switch connector C-301 terminal No.2. Q: Is the check result normal? YES: Go to Step 8 . NO: Repair the damaged harness wire, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 8. Check the clock spring. Refer to GROUP 52B, Air Bag Module(s) and Clock Spring . Q: Is the check result normal? YES: It can be assumed that this malfunction is intermittent, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18. NO: Replace the clock spring and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 9. Measure the voltage at auto-cruise control switch connector C-301. Turn the ignition switch to the "ON" position and the MAIN switch to the "ON" position. Measure the voltage between connector C-301 terminal No.3 and earth. OK: 0.5 V or less Turn the MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position. Q: Is the check result normal? YES: Go to Step 15 . NO: Go to Step 10.
STEP 10. Measure the voltage at engine-A/T-ECU connector C-138. Turn the ignition switch to the "ON" position and the MAIN switch to the "ON" position. Measure the voltage between engine-A/T-ECU connector C-138 terminal No.146 and earth. OK: 0.5 V or less Turn the MAIN switch to the "OFF" position and the ignition switch to the "OFF" position. Q: Is the check result normal? YES: Go to Step 12 . NO: Go to Step 11.
STEP 11. Connector check: C-138 engine-A/T-ECU connector Q: Is the check result normal? YES: Install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 17. NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 12. Connectors check: C-138 engine-A/T-ECU connector, C-106 and C-302 intermediate connector, C-301 auto-cruise control switch connector, C-308 and C-309 clock spring connectors Q: Is the check result normal? YES: Go to Step 13 . NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 13. Check the harness between engine-A/T-ECU connector C-138 terminal No.146 and the auto-cruise control switch connector C-301 terminal No.3. Q: Is the check result normal? YES: Go to Step 14 . NO: Repair the damaged harness wire, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 14. Check the clock spring. Refer to GROUP 52B, Air Bag Module(s) and Clock Spring . Q: Is the check result normal? YES: It can be assumed that this malfunction is intermittent, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18. NO: Replace the clock spring and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 15. Connector check: C-301 auto-cruise control switch connector Q: Is the check result normal? YES: Go to Step 16 . NO: Repair or replace the faulty connector, and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 16. Check the auto-cruise control switch. Refer to . Q: Is the check result normal? YES: Install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 17. NO: Replace the auto-cruise control switch (Refer to ), and install the air bag module (driver’s side) (Refer to GROUP 52B, Air Bag Module(s) and Clock Spring ). Then go to Step 18.
STEP 17. Check the MUT-II/III diagnosis code No.15. Q: Is the MUT-II/IIIdiagnosis code No.15 set? YES: Replace the engine-A/T-ECU (Refer to GROUP 13C, Engine-A/T-ECU ). Then go to Step 18 . NO: It can be assumed that this malfunction is intermittent.
STEP 18. Check the MUT-II/III diagnosis code No.15. Q: Is the MUT-II/III diagnosis code No.15 set? YES: Return to Step 1 . NO: The procedure is complete.