Air Conditioning System: 7B-3
Diagnostic Information and Procedures
DTC B1553: CAN Communication Circuit Malfunction
S5JB0E7204026
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
5. To radiator fan relay No.3 21. A/C compressor 37. Indicator lamp, switch, selector
6. Ignition switch 22. Blower motor 38. To wheel speed sensor
7. Small lamp relay 23. Blower motor selector 39. To information display
8. To BCM 24. Radiator fan relay No.1 40. To ECM
9. Evaporator temperature sensor 25. Radiator fan No.1 41. To BCM
10. Inside air temperature sensor 26. Radiator fan relay No.2 42. To compressor relay
11. Temperature control actuator 27. Radiator fan relay No.3 43. To rear defogger relay
12. Air intake control actuator 28. Radiator fan No.2 44. To combination switch
13. Air flow control actuator 29. ECM 45. AUTO-ON head light system vehicle
14. Sunload sensor 30. Outside temperature sensor *: M16 engine model
15. Data link connector 31. ABS/ESP® control module
16. HVAC control module 32. BCM
DTC detecting condition Trouble area
HVAC control module receives error code from BCM continuously. • CAN communication circuit
• Steering angle sensor (if equipped)
• Keyless start control module (if
equipped)
• 4WD control module (if equipped)
• TCM (if equipped)
• Combination meter
• ABS/ESP® control module
•BCM
• HVAC control module
•ECM
Step Action Yes No
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM and BCM for DTC.
Is there DTC(s)?
Go to applicable DTC
diag. flow.
Substitute a known-
good HVAC control
module and recheck.
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