DTC No. 33: Control Module Communication Bus Off: Troubleshooting

WARNING: This page is about a different car, the 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Was "Keyless Start System Check" performed?	Go to Step 2.	Go to KEYLESS START SYSTEM CHECK .
2	Control module connector check Check connection of connectors of all control modules communicating by means of CAN. Recheck DTC. Is DTC No. 33 detected?	Go to Step 3.	Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
3	CAN communication circuit check Turn ignition switch to OFF position. Disconnect connectors of all control modules communicating by means of CAN. Check CAN communication circuit between control modules for open, short and high resistance. Is each CAN communication circuit in good condition?	Go to Step 4.	Repair circuit.
4	DTC check Check DTC for BCM. Is DTC U1073 detected?	Go to appropriate DTC diagnosis.	Go to Step 5.
5	DTC check Turn ignition switch to OFF position. Connect connectors of disconnected control modules communicating by means of CAN. Disconnect connector of any one control module other than keyless start control module. Recheck DTC for keyless start control module. Is DTC No. 33 detected?	Using same method, disconnect connectors of control module other than keyless start control module one by one to check if DTC No. 33 is detected. If DTC No. 33 is detected even though connector of control module other than keyless start control module is disconnected, substitute a known-good keyless start control module and recheck.	Check power and ground circuit of disconnected control module. If circuit is OK, substitute a known-good disconnected control module and recheck.