B1550
DTC B1550
CIRCUIT DESCRIPTION
The driver door module (DDM) supplies battery positive voltage to the power mirror switch. When the mirror select switch is placed in the left or right mirror position, the appropriate signal circuit is switched to 12 volts. The DDM senses the voltage change and allows control of the selected outside rearview mirror.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1550 Mirror Left Front or Right Front Select Switch Circuit
CONDITIONS FOR RUNNING THE DTC
- Battery voltage must be between 9-16 volts.
- The ignition switch is in the ON position.
CONDITIONS FOR SETTING THE DTC
The DDM senses an active state on both mirror select switch circuits greater than 3 seconds.
ACTION TAKEN WHEN THE DTC SETS
The DDM ignores the continuous inputs from the switch. The DDM will respond to all other valid switch inputs.
CONDITIONS FOR CLEARING THE DTC
When the fault is no longer present, the door module changes the current DTC to a history DTC. The door module will clear the history DTC after 50 fault free ignition cycles, or in a response to a scan tool command.
TEST
