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DTC U1804: Lost Communication with Inside Rearview Mirror Control Module
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Diagnostic Fault Information
Diagnostic Fault Information
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
B+
U1804
U1804
-
-
Low Speed GMLAN Serial Data
U0073, U0078*
U1804
U0073, U0078*
-
Ground
-
U1804
-
-
*Scan tool does not communicate with most low speed GMLAN device