Dtc P1615: Steering Lock Unit Communication Error - Suzuki SX4 Service Manual

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10C-11 Immobilizer Control System:

DTC P1615: Steering Lock Unit Communication Error

Wiring Diagram
Refer to "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". 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".
Detecting Condition and Trouble Area
Detecting Condition
• While registering the transponder code in ECM, the
keyless start control module sent a signal to ECM
indicating that the ID code could not be registered.
• The ID code could not be registered in the keyless start
control module or ECM.
Troubleshooting
Step
1
Was "Immobilizer Control System Check" performed?
2
Registration of ignition key
1) Register ignition key in use with ECM referring to
"Registration of the Ignition Key".
Was registration of ignition key completed?
3
DTC check of ECM
1) Check ECM for DTC referring to "DTC Check in Section
1A".
Is DTC U0073, U0101, U0121 and/or U0140 detected?
4
DTC check of keyless start control module
1) Check keyless start control module for DTC referring to
"DTC Check in Section 10E".
Is DTC detected?
5
Check for communication circuit between steering lock
unit and keyless start control module
1) Check for open, short, and high resistance in steering
lock unit circuit. Refer to Step 2 in "DTC No. 11:
Communication Error with Steering Lock Unit in Section
10E".
Is each circuit in good condition?
Action
Trouble Area
• Wire circuits between steering lock unit and keyless
start control module
• CAN communication circuit
• Steering lock unit
• Keyless start control module
• Combination meter
• TCM (if equipped)
• 4WD control module (if equipped)
• ABS control module
• BCM
• ECM
Yes
Go to Step 2.
Recheck ECM for DTC.
If DTC P1615 is still
detected, go to Step 3.
Go to applicable DTC
diag. flow.
Go to applicable DTC
diag. flow.
Go to Step 6.
S7RW0AA304009
No
Go to "Immobilizer
Control System Check".
Go to Step 3.
Go to Step 4.
Go to Step 5.
Repair malfunction part
and recheck.

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