Dtc U1144 (No. 1144): Lost Communication With Keyless Start Control Module - Suzuki Swift Sport 2004 Service & Repair Manual

10B-29 Body Electrical Control System:

DTC U1144 (No. 1144): Lost Communication with Keyless Start Control Module

Wiring Diagram
Refer to "DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control Module".
DTC Detecting Condition and Trouble Area
BCM can not receive data sent by CAN from keyless start control module for
longer than specified time continuously.
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC.
DTC Troubleshooting
Step
1 DTC check of BCM
Is DTC U1144 (No. 1144) and DTC U1073 (No. 1073)
detected together?
2 DTC check of keyless start control module
1) Check keyless start control module for DTC.
Is DTC No. 33 detected?
3 Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck BCM for DTC.
Is DTC U1144 (No. 1144) detected?
4 CAN communication circuit check
1) Disconnect connectors from BCM, combination meter
and keyless start control module.
2) Check CAN communication circuit for open, short and
high resistance.
• Between BCM and combination meter
• Between combination meter and keyless start control
module
Is each CAN communication circuit in good condition?
5 CAN communication circuit check
1) Disconnect connectors of all control modules
communicating by means of CAN.
2) Check CAN communication circuit between control
modules other than Step 4 for open, short and high
resistance.
Is each CAN communication circuit in good condition?
DTC detecting condition
Action
Trouble area
• CAN communication circuit
• Combination meter
• Keyless start control module
• BCM (included in junction block
assembly)
Yes
Go to "DTC U1073 (No.
1073): Control Module
Communication Bus
Off".
Go to "DTC No. 33:
Control Module
Communication Bus Off
in Section 10E".
Go to Step 4.
Go to Step 5.
Go to Step 6.
S7RS0BA204017
No
Go to Step 2.
Go to Step 3.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Repair circuit.
Repair circuit.