Suzuki GRAND VITARA Owner's Manual page 1724

10E-27 Keyless Start System:
DTC Detecting condition and trouble area
DTC detecting condition
Keyless start control module cannot receive data
sent by CAN from BCM
DTC Confirmation Procedure
1) Clear DTC referring to "DTC Clearance: ".
2) Turn ignition key knob by pushing ignition key knob.
3) Check DTC referring to "DTC Check: ".
Troubleshooting
Step
1 Was "Keyless Start System Check" performed?
2 DTC Check
Is DTC No. 33 detected?
3 DTC Check
1) Check BCM for DTC referring to "DTC Check: in
Section 10B"
Is DTC U1073, DTC U1100 or DTC U1101 detected?
4 BCM power and ground circuit check
1) Check BCM power and ground circuit for condition
referring to "BCM Power Circuit and Ground Circuit
Check: in Section 10B".
Is it in good condition?
5 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between keyless start
control module and BCM for open, short and high
resistance.
Is CAN communication circuit in good condition?
6 DTC check
1) Connect connectors of all control modules
communicating by means of CAN.
2) Check DTCs for ECM and TCM.
Is DTC P1678 detected by ECM and DTC P1778 by TCM?
• CAN communication circuit
• Keyless start control module
• BCM
Action
Trouble area
Yes
Go to Step 2.
Go to "DTC No. 33:
Control Module
Communication Bus
Off: ".
Go to applicable DTC
diag flow.
Go to Step 5.
Go to Step 6.
Substitute a known-
good BCM and recheck.
No
Go to "Keyless Start
System Check: ".
Go to Step 3.
Go to Step 4.
Repair circuit.
Repair circuit.
Substitute a known-
good keyless start
control module and
recheck.