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P1615




DTC P1615: Steering Lock Unit Communication Error (for Vehicle with Keyless Start System)

Immobilizer Control System Wiring Circuit Diagram

Circuit Description

When the transponder code in the ignition key is registered in ECM, the remote controller 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 remote controller 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:

- Perform the troubleshooting for 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. Diagnostic Trouble Code (DTC) confirmation

Clear DTC(s) referring to DTC Clearance DTC Clearance.
Turn ignition switch to OFF position.
Check if any DTC is detected referring to DTC Check DTC Check.

Is DTC P1615 still detected?
YES -
Go to Step 2.
NO -
The troubleshooting is completed.

2. Registration of the ignition key

Turn ignition switch to OFF position.
Turn ignition switch to ON position, and register the transponder code in the transponder in the ignition key with ECM referring to Registration of the Ignition Key Registration of the Ignition Key.

Was it possible to register the ignition key (transponder code) in ECM?
YES -
The troubleshooting is completed.
NO -
Go to Step 3.

3. Diagnostic Trouble Code (DTC) check

Check if any DTC is detected referring to DTC Check DTC Check.

Is any DTC detected?
YES -
Perform the troubleshooting referring to the corresponding flowchart, and then go to Step 4.
NO -
Replace ECM with a known-good one and recheck.

4. Steering lock unit check

Turn on the engine start knob of the keyless start system.

Does engine start when engine start knob is at ON position?
YES -
Replace the steering lock unit with a known-good one and recheck.
NO -
Go to Step 5.

5. Steering lock unit operation check

Check the steering lock unit for operation referring to Ignition Switch Inspection Ignition Switch Inspection.

Does the engine start knob operate as specified?
YES -
Go to Step 6.
NO -
Replace the steering lock unit referring to Steering Lock Assembly (Ignition Switch) Removal and Installation Steering Lock Assembly (Ignition Switch) Removal and Installation.

6. Check for open in wire circuits between steering lock unit and keyless start control module

Disconnect steering lock unit connector "G22" and keyless start control module connector "G42".
Measure resistance at the following connector terminals.
- Between "G22-3" terminal of steering lock unit connector and "G44-20" terminal of keyless start control module connector.
- Between "G22-7" terminal of steering lock unit connector and "G44-29" terminal of keyless start control module connector.
- Between "G22-8" terminal of steering lock unit connector and "G44-30" terminal of keyless start control module connector.

Is each resistance 1 ohms or less?
YES -
Go to Step 7.
NO -
Repair open or high resistance in malfunctioning wire circuit.

7. Check for short of wire circuits between steering lock unit and keyless start control module

Measure resistance at the following connector terminals.
- Between "G22-3", "G22-7" and "G22-8" terminal of steering lock unit connector.
- Between "G44-20", "G44-29" and "G44-30" terminal of keyless start control module.

Is each resistance infinity?
YES -
Go to Step 8.
NO -
Make sure of insulation of each wire circuit.

8. Check for short to ground wire circuit in wire circuits between steering lock unit and keyless start control module

Measure resistance at the following connector terminals.
- Between "G22-3" terminal of steering lock unit connector and vehicle body ground.
- Between "G22-7" terminal of steering lock unit connector and vehicle body ground.
- Between "G22-8" terminal of steering lock unit connector and vehicle body ground.
- Between "G44-20" terminal of keyless start control module connector and vehicle body ground.
- Between "G44-29" terminal of keyless start control module connector and vehicle body ground.
- Between "G44-30" terminal of keyless start control module connector and vehicle body ground.

Is each resistance infinity?
YES -
Go to Step 9.
NO -
Repair short to ground wire circuit in malfunctioning wire circuit.

9. Check for short to power supply wire circuit in wire circuits between steering lock unit and keyless start control module

Measure voltage at the following connector terminals with ignition switch turned ON.
- Between "G22-3" terminal of steering lock unit connector and vehicle body ground.
- Between "G22-7" terminal of steering lock unit connector and vehicle body ground.
- Between "G22-8" terminal of steering lock unit connector and vehicle body ground.
- Between "G44-20" terminal of keyless start control module connector and vehicle body ground.
- Between "G44-29" terminal of keyless start control module connector and vehicle body ground.
- Between "G44-30" terminal of keyless start control module connector and vehicle body ground.

Is each voltage 0 - 1 V?
YES -
Replace keyless start control module with a known-good one and recheck. If DTC P1615 is still detected, replace ECM with a known-good one and recheck.
NO -
Repair short to power supply wire circuit in malfunctioning wire circuit.

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