The switch that failed and generated this DTC is a built-in part of the driver door switch assembly (DDSA). This assembly contains a microprocessor which takes the signal generated by the switch and assigns a digital message to the switch signal. The DDSA then sends this message over the serial data class 2 line to the driver door module (DDM) and the passenger front door module (PFDM) to move the mirrors. The DDM and the PFDM then apply voltage and ground to the appropriate circuit of their respective mirror fold motor to fold/retract or unfold/extend the mirrors. The mirror fold motors are reversible.

This diagnostic procedure supports the following DTC:

DTC B1717 Mirror Power Fold Control Switch Circuit Low

The self diagnostic test runs once every 30 seconds regardless of source voltage.

If the DDSA detects that the switch is closed for more than 30 continuous seconds, it sets this DTC.

The DDSA deactivates and ignores inputs from the failed switch contacts and stops sending messages for this switch to the DDM and the PFDM. The DDSA will continue to respond to inputs from other non-failed switch contacts.

The DDSA clears this DTC when the switch message status changes.

An intermittently sticking or binding switch may cause this DTC to set. Refer to Testing for Electrical Intermittents .