B1590

DTC B1590

Circuit Description

The driver door module (DDM) and the passenger door module (PDM) receive mirror position signals from the mirror horizontal and vertical position sensors. These signals are used by the door modules for memory recall functions of the driver and passenger mirrors. The door modules command the mirror memory settings based upon the voltage level received back from the position sensors. Each door module provides a 5 volt supply, a signal and a ground circuit for each of the position sensors. The horizontal and vertical position sensors are variable resistors that the door modules monitor voltage levels across. When a memory setting is recalled, the door modules command the mirror motors in the appropriate directions until the stored position sensor voltage levels are achieved. The DDM and PDM monitor the signal circuits to determine if the voltage level is out of range. If the DDM or PDM detects a voltage level out of range for greater than 2 seconds, a DTC is set.

^ DTC B1580 Left Front/Driver Mirror Horizontal Position Sensor Circuit
^ DTC B1590 Left Front/Driver Mirror Vertical Position Sensor Circuit

Conditions for Setting the DTC

^ The DDM or PDM detects a mirror position sensor signal voltage range under 0.5 volt or over 4.5 volts.
^ Condition must be present for greater than 2 seconds.

Action Taken When the DTC Sets

Stores DTC B1580, or B1590 in the DDM or PDM memory.

Conditions for Clearing the DTC

^ The DDM or PDM detects the correct mirror horizontal or vertical position sensor signal voltage range for longer than 2 seconds, and:
^ The DTC is cleared using a scan tool.

Diagnostic Aids

^ If DTC B1580 and B1590 are both set, the low reference circuit may be open, or the 5 volt reference circuit may be open, short to ground or short to voltage.
^ An intermittent malfunction may be caused by an intermittent open, short to ground or short to voltage in a mirror signal circuit.
^ If the DTC does not reset after the code is cleared, then the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This tests the mirror position sensor signal voltage using a scan tool. Normal signal voltage range is 0.5-4.5 volts.