B1580

DTC B1580

CIRCUIT DESCRIPTION
The driver door module (DDM) and 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 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. For more detailed information concerning power mirror operation refer to Outside Mirror Description and Operation.

DTC DESCRIPTORs
This diagnostic procedure supports the following DTCs:
- DTC B1580 Mirror Horizontal Position Sensor Circuit
- DTC B1590 Mirror Vertical Position Sensor Circuit

CONDITIONS FOR RUNNING THE DTC
Battery voltage must be between 9-16 volts.

CONDITIONS FOR SETTING THE DTC
These DTCs will set if:
- A mirror position sensor signal voltage is below 0.5 volts for 2 seconds.
- A mirror position sensor signal voltage is above 4.5 volts for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The door module will ignore the failed position sensor.
- The door module will ignore memory set or recall for the mirrors.
- Manual mirror movements will be allowed.

CONDITIONS FOR CLEARING THE DTC
- The condition responsible for setting the DTC no longer exists.
- You issue a scan tool CLEAR DTCs command.

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.
- Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Diagnostic Aids for Circuit Testing and Wiring Repair Procedures. Component Tests and General Diagnostics

TEST

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