(Heating & Air Conditioning - Electrical Diagnostics - 500 - Except Electric)

• Diagnostic Code Index
• DTC Troubleshooting
  • B1901-11-Front Mode Door 1 Sensor Control - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1901-15-Front Mode Door 1 Sensor Control - Circuit Short To Battery Or Open
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1902-11-Front Mode Door 1 Actuator Control - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1902-12-Front Mode Door 1 Actuator Control - Circuit Short To Battery
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1902-77-Front Mode Door 1 Control - Commanded Position Not Reachable
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1905-11-Main/Left Temperature Door 1 Sensor Control - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1905-15-Main/Left Temperature Door 1 Sensor Control - Circuit Short To Battery Or Open
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1906-11-Main/Left Temperature Door 1 Actuator Control - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1906-12-Main/Left Temperature Door 1 Actuator Control - Circuit Short To Battery
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1906-77-Main/Left Temperature Door 1 - Commanded Position Not Reachable
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1909-11-RECIRCULATION Door Control - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1909-12-RECIRCULATION Door Control - Circuit Short To Battery
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1909-77-RECIRCULATION Door - Commanded Position Not Reachable
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1914-11-Panel Duct Temperature Sensor - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1914-15-Panel Duct Temperature Sensor - Circuit Short To Battery Or Open
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1915-11-Floor Duct Temperature Sensor - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1915-15-Floor Duct Temperature Sensor - Circuit Short To Battery Or Open
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1916-11-Evaporator Temperature Sensor - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1916-15-Evaporator Temperature Sensor - Circuit Short To Battery Or Open
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1917-11-Cabin Temperature Sensor - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1917-15-Cabin Temperature Sensor - Circuit Short To Battery Or Open
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1918-49-Cabin Temperature Sensor Micro Fan - Internal Electronic Failure
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1919-16-Blower Motor Control - Circuit Voltage Below Threshold
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1919-17-Blower Motor Control - Circuit Voltage Above Threshold
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1923-42-General Memory Failure
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1924-49-Control Head - Internal Electronic Failure
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1926-11-Mode/Temperature Door Voltage Reference - Circuit Short To Ground
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1926-12-Mode/Temperature Door Voltage Reference - Circuit Short To Battery
    • Notes
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U0019-87-Can B Bus - No Signal
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U0019-88-Can B Bus Off
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U1700-86-Implausible Data Received From BCM
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U1700-87-Lost Communication With BCM
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U1701-86-Implausible Data Received From Pcm
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U1701-87-Lost Communication With Pcm
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U1703-86-Implausible Data Received From IPC
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U1703-87-Lost Communication With IPC
    • Notes
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
• Standard Procedure
  • HVAC Verification Test
  • HVAC Pre-Diagnostic Troubleshooting Procedure