Dtc U1144 (No. 1144): Lost Communication With Keyless Start Control Module - Suzuki Grand Vitara 2011 Manual

10B-31 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
DTC detecting condition
BCM can not receive CAN data 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) Turn ignition switch to OFF position.
2) Disconnect connectors of BCM and keyless start control
module.
3) Check CAN communication circuit between BCM and
keyless start control module for open, short and high
resistance.
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?
6 Key indicator light operation check
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Push ignition knob switch of steering lock unit.
Does key indicator light turn ON?
Action
Trouble area
• CAN communication circuit
• Keyless start control module
• BCM
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.
Go to Step 7.
S6JB0AA204016
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.
Check keyless start
control module power
and ground circuit. If
circuit is OK, substitute
a known-good keyless
start control module and
recheck.