P1615

DTC P1615: Steering Lock Unit Communication Error

Wiring Diagram

Refer to Immobilizer Control System Wiring Circuit Diagram Immobilizer Control System Wiring Circuit Diagram.

Circuit Description

When the transponder code in the ignition key is registered in ECM, the ID code is registered in both ECM and keyless start control module at the same time. This DTC is detected only in case that the ID code cannot be registered in both ECM and keyless start control module when the transponder code in the ignition key is registered in ECM.

NOTE:

- Troubleshoot DTC P1618 first if both DTC P1615 and P1618 are detected at the same time.
- After replacing ECM, be sure to register the transponder code in the ignition key with ECM referring to Registration of the Ignition Key Registration of the Ignition Key. After replacing the keyless start control module of the vehicle equipped with the keyless start system, be sure to perform Registration of the Ignition Key Registration of the Ignition Key.

Detecting Condition and Trouble Area






Troubleshooting

1.
Was "Immobilizer Control System Check" performed?
YES -
Go to Step 2.
NO -
Go to Initial Inspection and Diagnostic Overview Immobilizer Control System Check.

2. Registration of ignition key

Register ignition key in use with ECM referring to Registration of the Ignition Key Registration of the Ignition Key.

Was registration of ignition key completed?
YES -
Recheck ECM for DTC. If DTC P1615 is still detected, go to Step 3.
NO -
Go to Step 3.

3. DTC check of ECM

Check ECM for DTC referring to DTC Check DTC Check.

Is DTC U0073, U0101, U0121, U0140 and/or U0155 detected?
YES -
Go to applicable DTC troubleshooting.
NO -
Go to Step 4.

4. DTC check of keyless start control module

Check keyless start control module for DTC referring to DTC Check DTC Check.

Is DTC detected?
YES -
Go to applicable DTC troubleshooting.
NO -
Go to Step 5.

5. Check for communication circuit between steering lock unit and keyless start control module

With the ignition switch at OFF position, disconnect steering lock unit connector and keyless start control module connector.
Check for proper connection at terminals and wires of each connector referring to Intermittent and Poor Connection Inspection Intermittent and Poor Connection Inspection.
If OK, check for open, short, and high resistance in each circuit between steering lock unit and keyless start control module. Refer to Step 2 in DTC 11 DTC No. 11: Communication Error with Steering Lock Unit.

Is each circuit in good condition?
YES -
Go to Step 6.
NO -
Repair circuit.

6. Steering lock unit power supply check

Connect keyless start control module connector.
With ignition switch at ON position, check power supply terminal voltage of steering lock unit connector. Refer to Step 3 in DTC 11 DTC No. 11: Communication Error with Steering Lock Unit.

Is voltage 4 - 6 V?
YES -
Replace steering lock unit and recheck.
NO -
Substitute a known-good keyless start control module and recheck. If DTC P1615 is still detected, substitute a known-good ECM and recheck.