Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Instrument cluster power supply voltage or body ground malfunction
• Open circuit in wiring harness between instrument cluster and connector C-63
• Connector C-63 malfunction
• Instrument cluster malfunction

System wiring diagram

Fig 1: Instrument Cluster Communication Diagram

Courtesy of MAZDA MOTORS CORP.

• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Climate control unit power supply voltage or body ground malfunction
• Open circuit in wiring harness between climate control unit and connector C-63
• Connector C-63 malfunction
• Climate control unit malfunction

System wiring diagram

Fig 1: Climate Control Unit Communication Diagram

Courtesy of MAZDA MOTORS CORP.

• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Open circuit in wiring harness between connector C-63 and connector C-64
• Connector C-63 malfunction
• Connector C-64 malfunction

System wiring diagram

Fig 1: Climate Control Unit Communication Diagram

Courtesy of MAZDA MOTORS CORP.