(Heating & Air Conditioning - Electrical Diagnostics)

• Diagnostic Code Index
• DTC Troubleshooting
  • B1901-11 - Distribution Defrost Left Motor Feedback-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1901-15 - Distribution Defrost Left Motor Feedback-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1902-11 - Distribution Defrost Left Motor Command-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1902-12 - Distribution Defrost Left Motor Command-Circuit Short To Battery
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1902-77 - Distribution Defrost Left Motor Command-Commanded Position Not Reachable
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1903-11 - Distribution Defrost Right Motor Feedback-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1903-15 - Distribution Defrost Right Motor Feedback-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1904-11 - Distribution Defrost Right Motor Command-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1904-12 - Distribution Defrost Right Motor Command-Circuit Short To Battery
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1904-77 - Distribution Defrost Right Motor Command-Commanded Position Not Reachable
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1905-11 - Distribution Vent Floor Left Motor Feedback-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1905-15 - Distribution Vent Floor Left Motor Feedback-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1906-11 - Distribution Vent Floor Left Motor Command-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1906-12 - Distribution Vent Floor Left Motor Command-Circuit Short To Battery
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1906-77 - Distribution Vent Floor Left Motor Command-Commanded Position Not Reachable
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1907-11 - Distribution Vent Floor Right Motor Feedback-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1907-15 - Distribution Vent Floor Right Motor Feedback-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1908-11 - Distribution Vent Floor Right Motor Command-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1908-12 - Distribution Vent Floor Right Motor Command-Circuit Short To Battery
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1908-77 - Distribution Vent Floor Right Motor Command-Commanded Position Not Reachable
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1909-11 - Distribution Rear Motor Feedback-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1909-15 - Distribution Rear Motor Feedback-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1910-11 - Distribution Rear Motor Command-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1910-12 - Distribution Rear Motor Command-Circuit Short To Battery
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1910-77 - Distribution Rear Motor Command-Commanded Position Not Reachable
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1911-11 - Mixer Motor Feedback Left Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1911-15 - Mixer Motor Feedback Left Side-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1912-11 - Mixer Motor Command Left Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1912-12 - Mixer Motor Command Left Side-Circuit Short To Battery
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1912-77 - Mixer Motor Command Left Side-Commanded Position Not Reachable
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1913-11 - Mixer Motor Feedback Right Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1913-15 - Mixer Motor Feedback Right Side-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1914-11 - Mixer Motor Command Right Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1914-12 - Mixer Motor Command Right Side-Circuit Short To Battery
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1914-77 - Mixer Motor Command Right Side-Commanded Position Not Reachable
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1915-11 - RECIRCULATION Motor Feedback-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1915-15 - RECIRCULATION Motor Feedback-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1916-11 - RECIRCULATION Motor Command-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1916-12 - RECIRCULATION Motor Command-Circuit Short To Battery
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1916-77 - RECIRCULATION Motor Command-Commanded Position Not Reachable
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1920-11 - Sun Irradiation Sensor Left Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1920-15 - Sun Irradiation Sensor Left Side-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1921-11 - Sun Irradiation Sensor Right Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1921-15 - Sun Irradiation Sensor Right Side-SC To VBATT Or OC Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1924-11 - Treated Air Temperature Sensor Input Vent Right Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1924-15 - Treated Air Temperature Sensor Input Vent Right Side-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1925-11 - Treated Air Temperature Sensor Input Floor Right Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1925-15 - Treated Air Temperature Sensor Input Floor Right Side-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1926-11 - Treated Air Temperature Sensor Input Vent Left Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1926-15 - Treated Air Temperature Sensor Input Vent Left Side-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1927-11 - Treated Air Temperature Sensor Input Floor Left Side-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1927-15 - Treated Air Temperature Sensor Input Floor Left Side-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1930-11 - Evaporator Temperature Sensor-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1930-15 - Evaporator Temperature Sensor-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1931-11 - Internal Temperature Sensor-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1931-15 - Internal Temperature Sensor-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1935-11 - Air Quality Sensor-Circuit Short To Ground
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1935-15 - Air Quality Sensor-Circuit Short To Battery Or Open
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1935-96 - Air Quality Sensor-Component Internal Failure
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1937-64 - HVAC Control Panel Module Lin Bus-Signal Plausibility Failure
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1938-64 - Humidity Sensor Lin Bus-Signal Plausibility Failure
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1938-96 - Humidity Sensor Lin Bus-Component Internal Failure
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1940-16 - Cabin Fan-Circuit Voltage Below Threshold
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1940-17 - Cabin Fan-Circuit Voltage Above Threshold
    • Wiring Diagram
    • Theory Of Operation
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1941-11 - PTC Low Power Relay Driving Command Output-Circuit Short To Ground
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1941-15 - PTC Low Power Relay Driving Command Output-Circuit Short To Battery Or Open
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1942-11 - PTC Medium Power Relay Driving Command Output-Circuit Short To Ground
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1942-15 - PTC Medium Power Relay Driving Command Output-Circuit Short To Battery Or Open
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1943-11 - PTC High Power Relay Driving Command Output-Circuit Short To Ground
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1943-15 - PTC High Power Relay Driving Command Output-Circuit Short To Battery Or Open
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1945-11 - External Control Variable Displacement Command-Circuit Short To Ground
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1945-15 - External Control Variable Displacement Command-Circuit Short To Battery Or Open
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1947-42 - Ram ROM EEPROM Etc Internal Failure-General Memory Failure
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • B1948-49 - Keyboard NA-Jammed Key Internal Electronic Failure
    • Wiring Diagram
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U0001-87-Can Line-Missing Message
  • U0001-88-Can Line-Bus Off
  • U1700-86-Body Computer Module (BCM) - Signal Invalid
  • U1700-87 - Body Control Module (BCM) - Missing Message
  • U1703-86-IPC (Instrument Panel Cluster) - Signal Invalid
  • U1703-87-Instrument Panel Cluster (IPC) - Missing Message
  • U1724-86 - Entertainment TELEMATIC Module (ETM) - Invalid Signal
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
  • U1724-87 - Entertainment TELEMATIC Module (ETM) - Missing Message
    • When Monitored
    • Set Condition
    • Possible Causes
    • Diagnostic Test
• Standard Procedure
  • HVAC Verification Test
  • Pre-Diagnostic Troubleshooting Procedure
    • Wiring Diagram