Code No.U1006 Security alarm siren LIN timeout <Vehicles with security alarm sensor>
| caution | Before replacing the ECU, ensure that the communication
circuit is normal. |
JUDGEMENT CRITERIA
PROBABLE CAUSES
- Faulty security alarm siren
- Faulty LIN cutoff control unit
- Malfunction of the LIN bus
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-403, C-410, C-411 and C-417 ETACS-ECU connectors, C-02 LIN cutoff control unit connector, A-64 security alarm siren connector
Q.
Is the check result normal?
STEP 2. Resistance measurement at the A-64 security alarm siren connector
| (1)Disconnect the connector, and measure at the wiring harness side. |
| (2)Measure the resistance between the A-64 security alarm siren connector terminal
No. 1 and the body earth. OK: Continuity exists (2 Ω or less) |
Q.
Is the check result normal?
STEP 3. Wiring harness check from A-64 security alarm siren connector terminal No. 1 to body earth
| note | Prior to the wiring harness inspection, check intermediate connector A-04, and repair
if necessary. |
Q.
Is the check result normal?
STEP 4. Voltage measurement at the A-64 security alarm siren connector.
| (1)Disconnect the connector, and measure at the wiring harness side. |
| (2)Measure the voltage between the A-64 security alarm siren connector terminal No.
2 and the body earth. OK: System voltage |
Q.
Is the check result normal?
STEP 5. Wiring harness check between the A-64 security alarm siren connector terminal No. 2 and the C-403 ETACS-ECU connector terminal No. 4
| note | Prior to the wiring harness inspection, check intermediate connector A-04, and repair
if necessary. |
Q.
Is the check result normal?
STEP 6. LIN cutoff control unit check
Q.
Is the check result normal?
STEP 7. Voltage measurement at the C-410 ETACS-ECU connector.
| (1)Disconnect the connector, and measure at the wiring harness side. |
| (2)Measure the voltage between the C-410 ETACS-ECU connector terminal No. 9 and the
body earth. OK: System voltage |
Q.
Is the check result normal?
STEP 8. Wiring harness check between the C-417 ETACS-ECU connector terminal No. 10 and the C-02 LIN cutoff control unit connector terminal No. 1
| note | Prior to the wiring harness inspection, check joint connector C-102, and repair if necessary. |
Q.
Is the check result normal?
STEP 9. Wiring harness check between the C-02 LIN cutoff control unit connector terminal No. 8 and the C-410 ETACS-ECU connector terminal No. 9
| note | Prior to the wiring harness inspection, check intermediate connector C-128, and repair
if necessary. |
Q.
Is the check result normal?
STEP 10. Check the wiring harness wires between C-411 ETACS-ECU connector terminal No. 1 and C-02 LIN cutoff control unit connector terminal No. 7.
| note | Prior to the wiring harness inspection, check joint connector C-102, and repair if necessary. |
Q.
Is the check result normal?
STEP 11. Check the wiring harness wires between C-02 LIN cutoff control unit connector terminal No. 5 and A-64 security alarm siren connector terminal No. 3.
| note | Prior to the wiring harness inspection, check intermediate connectors A-04 and C-128,
and repair if necessary. |
Q.
Is the check result normal?
STEP 12. Replace the security alarm siren temporarily, and check whether the diagnosis code is set.
| (1)Erase the diagnosis code. |
| (2)Turn the ignition switch from the LOCK (OFF) position to the ON position. |
| (3)Check if diagnosis code is set. |
Q.
Is the diagnosis code set?