DTC output pattern and malfunctioning location: B

B 

Possible cause 

• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Open circuit in wiring harness between climate control unit and connector C-45
• Connector C-45 malfunction
• Climate control unit malfunction

Fig 1: Multiplex Communication System - Wiring Diagram (For Connector C-45)

Inspection item 

• Climate control unit connector
• Connector C-45
• Wiring harness between climate control unit terminal 1W and connector C-45
• Wiring harness between climate control unit terminal 1X and connector C-45
• Climate control unit