Inspection Procedure:
4 IG knob will not turn (Keyless operation is not recongnised).
caution
Before replacing the ECU,
ensure that the communication circuit is normal.
PROBABLE CAUSES
Customisation function setting
Damaged wiring harness and connectors
Malfunctions of the steering lock push switch
Malfunction of the keyless operation key
Malfunction of the receiver antenna module
Malfunction of KOS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check the power supply circuit and the ground
circuit to KOS-ECU.
Refer to Inspection procedure 2 "Abnormality in KOS-ECU power supply and ground circuits" .
Q.
Is the check result normal?
Go to Step 2.
Repair the power supply circuit and the ground circuit to KOS-ECU.
STEP 2. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 3.
STEP 3. M.U.T.-III diagnosis code
Check whether a KOS-related diagnosis code is set.
Q.
Is the diagnosis code set?
Refer to .
Go to Step 4.
STEP 4. Check the customise function.
Check if "KOS feature" is set to "Both enable" or "ENG strt enable" with a customisation
function of M.U.T.-III.
Q.
Is it set to "Both enable" or "ENG strt enable"?
Go to Step 5.
Set "KOS feature" to "Both enable" or "ENG strt enable" with a customisation function
of M.U.T.-III (Refer to ).
STEP 5. Ignition push switch check
(1)Disconnect the KOS-ECU connector C-104.
(2)With the IG knob push switch pressed, measure the resistance at the harness-side connector.
(3)Resistance between the KOS-ECU connector C-104 terminal No. 8 and 34. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 6.
Check the C-104 KOS-ECU connector, the C-211 key reminder switch connector, the
C-317 ETACS-ECU connector, and the wiring harness between the C-104 KOS-ECU connector (terminal
No. 5/8) and the C-211 key reminder switch connector (terminal No. 9/4), and
between the C-211 key reminder switch connector (terminal No. 1) and the C-317 ETACS-ECU connector
(terminal No. 10), and repair them if necessary. If they are normal, replace the key reminder
switch.
STEP 6. Key reminder switch check
(1)Disconnect the C-315 ETACS-ECU connector.
(2)Measure the resistance at the harness-side connector with the ignition key removed
from the ignition key cylinder.
(3)Check the continuity between the C-315 ETACS-ECU connector terminal No. 13 and the earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 7.
Check the C-211 key reminder switch connector, the C-315 ETACS-ECU connector,
the wiring harness between the C-211 key reminder switch connector (terminal No. 3) and the
C-315 ETACS-ECU connector (terminal No. 13), and between the C-211 key reminder switch connector
(terminal No. 2) and the earth. If they are normal, replace the key reminder switch.
STEP 7. Check with another registered keyless operation key.
Q.
Does the IG knob turn? (Is the keyless operation key recognised?)
Replace the keyless operation key with which the IG knob does not turn (no recognition)
and register the ID codes (Refer to ).
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Go to Step 2.
Repair the power supply circuit and the ground circuit to KOS-ECU.)
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