DTC B337: Loss Of HVAC Programmer Data: Description

WARNING: This page is about a different car, the 1988 Cadillac Allante and 1987 Cadillac Allante. However, it is still accessible from the selected car via links, so may be relevant.

Code B337 will set if the ignition is on and the BCM is not able to exchange data with the HVAC programmer. The fault could be due to a loss of 12 volts power or ground to the programmer or a double open in the programmer data line, one on each side of the component. When this codes is set, the A/C clutch will be disabled and the blower runs at a constant 6 volts.