Code Definition

B1742 — Mirror Passenger Vertical Switch Circuit Open

System: Body  |  Type: Manufacturer-Specific  |  Make: Ford

About B1742

B1742 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1742 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1742 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Driver Door Module (DDM) or Body Control Module (BCM) monitors the passenger side exterior mirror vertical switch input line, which carries the switch state from the driver door selector back to the module when the user has the passenger mirror selected. DTC B1742 is set when the module detects an open circuit on this input, meaning the signal path between the switch contacts and the module input pin is broken. The module expects to see a defined voltage or resistance change when the switch is operated up or down, and an open results in no change or a steady high impedance reading. When th...

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