Inspection Procedure 15
Inspection Procedure 15: Outer tone alarm does not sound.
CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
OPERATION
The outer tone alarm sounds under the following conditions.
- When the door is locked or unlocked with the keyless or keyless operation function
- Door lock does not operate.
- The keyless operation key is brought out of the vehicle.
- Also, with a customization function, "Tone alarm answer back" may be set to "Not Sound Tone alarm."
PROBABLE CAUSES
- Malfunction of the antenna and outer tone alarm assembly
- Malfunction of the KOS-ECU
- Malfunction of the connector
- Function setting error or no setting with a customization
DIAGNOSTIC PROCEDURE
STEP 1. Using scan tool MB991958, read the diagnostic trouble code.
(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Check whether the KOS-ECU related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the DTC set?
YES Diagnose the KOS-ECU. Refer to Keyless Operation System (KOS).
NO Go to Step 2.
STEP 2. Check the customize function.
Check that either of the followings other than "Not sound tone alarm" is set for "Tone alarm answer back" with the customization function.
- At keyless key
- At keyless
- At Both
Q. Is the check result normal?
YES Go to Step 3.
NO Set either of the followings other than "Not sound tone alarm" for "Tone alarm answer back" with the customization function (Refer to Programming and Relearning).
STEP 3. Using scan tool MB991958, read the actuator test.
(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Check that the outer tone alarm sounds (Refer to Actuator Test Reference Table).
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the DTC set?
YES Go to Step 6.
NO Go to Step 4.
STEP 4. Check KOS-ECU connector C-102 and outer tone alarm connector F-13 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Are KOS-ECU connector C-102 and outer tone alarm connector F-13 in good condition?
YES Go to Step 5.
NO Repair or replace the damaged component(s). Harness Connector Inspection. Check that the outer tone alarm works normally.
STEP 5. Check the wiring harness between KOS-ECU connector C-102 (terminal Nos. 35 and 37) and outer tone alarm connector F-13 (terminal Nos. 1 and 2).
- Check the power supply and ground lines for open circuit.
NOTE:
Also check intermediate connector C-32 and F-17 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-32 and F-17 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection Harness Connector Inspection.
Q. Is the wiring harness between KOS-ECU connector C-102 (terminal Nos. 35 and 37) and outer tone alarm connector F-13 (terminal Nos. 1 and 2) in good condition?
YES Go to Step 6.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the outer tone alarm works normally.
STEP 6. Check of the troubles
Check that the outer tone alarm sounds when the outer tone alarm sounding conditions are met.
Q. Is the check result normal?
YES Intermittent malfunction is suspected. How to Cope With Intermittent Malfunctions).
NO Replace KOS-ECU and register the ID codes (Refer to ID Codes Registration Procedure).