Suzuki GRAND VITARA JB416 Service Manual page 437

DTC U1144 (No. 1144): Lost Communication with Keyless Start Control Module
Wiring Diagram
Refer to "DTC U1073 (No. 1073): Control Module Communication Bus Off: ".
DTC Detecting Condition and Trouble Area
DTC detecting condition
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) Turn ignition switch to OFF position.
2) Disconnect connectors of BCM and keyless start control
module communicating by means of CAN.
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 lamp 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 lamp turn ON?
Action
Body Electrical Control System:
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.
10B-17
S5JB0EA204016
No
Go to Step 2.
Go to Step 3.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00 in related manual".
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.