B1591

DTC B1591

Circuit Description

The LH mirror and the RH mirror vertical position sensors are potentiometers. The driver door module (DDM) and the passenger door module (PDM) determine the vertical position of the mirrors based on the signal voltage from these sensors.

DTC Descriptors

This diagnostic procedure supports the following DTC:

DTC B1591 Mirror Vertical Position Sensor Circuit Range/Performance

Conditions for Running the DTC

The DDM and the PDM must be powered up.

Conditions for Setting the DTC

The code will be set when the signal voltage of the mirror vertical position sensor is above or below the range limits, within 10 percent, for 30 seconds in the requested position. The out of range voltage limits depend upon what the actual voltage of the 5-volt reference circuit is, and will vary from vehicle to vehicle and from module to module. Use the table below to determine what the out of range voltage limits are for your particular vehicle/module.






Action Taken When the DTC Sets

Mirror vertical memory movements are disabled. Manual movements are not disabled.

Conditions for Clearing the DTC

When the door modules no longer sense the failure

Diagnostic Aids

* If the Personalization Option in the dash integration module (DIM) is activated on a vehicle that does not have the A45 memory option, DTCs B1586 and B1591 will be erroneously set. If DTCs B1586 and B1591 are set on a vehicle that does not have the A45 memory option, refer to Dash Integration Module Programming and Setup to deactivate the option.
* After readjusting the mirror positions, be sure to reset the memory switch to the new mirror positions.
* If this DTC is set as a history DTC, but not as a current DTC, remove the fuse for the door module that set the DTC for 10 seconds, then reinstall it.
* The mirror position sensors are part of the mirror motor pack assembly and are not serviced separately.

Test Description

Step 1 - Step 10:

Step 11 - Step 19:

The numbers below refer to the step numbers on the diagnostic table.
5. This step verifies the integrity of the mirror 5-volt reference circuit.
6. This step verifies that the mirror position sensor low reference circuit is not open.
7. This step verifies that the voltage applied by the door module to the vertical position sensor signal circuit is within the appropriate range. When the mirror motor harness connector is disconnected, the measured voltage should be 3.5-5.0 volts.
9. This step verifies that the door module recognizes the vertical position sensor signal circuit voltage being pulled to ground.