Suzuki Swift Sport 2004 Service & Repair Manual page 1488

10E-26 Keyless Start System:
Troubleshooting
Step
1 Was "Keyless Start System Check" performed?
2 DTC check of keyless start control module
Is DTC No. 33 detected?
3 DTC check of BCM
1) Check BCM for DTC.
Is DTC U1073, DTC U1100 or DTC U1101 detected?
4 Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck keyless start control module for DTC.
Is DTC No.31 detected?
5 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?
6 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 5 for open, short and high
resistance.
Is each CAN communication circuit in good condition?
7 DTC check of ECM
1) Connect connectors disconnected control module
communications by means of CAN.
2) Check ECM for DTC.
Is DTC P1678 detected?
Action 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.
Go to Step 7.
Check BCM power and
ground circuit. If circuit
is OK, substitute a
known-good BCM and
recheck.
No
Go to "Keyless Start
System Check".
Go to Step 3.
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Repair circuit.
Repair circuit.
Go to Step 8.