Diagnostic Instructions
DTC Descriptors
DTC B1580 00: Mirror Horizontal Position Sensor Circuit
DTC B1590 00: Mirror Vertical Position Sensor Circuit
Circuit/System 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
.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
| • | 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. |
Actions 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. |
| • | A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred. |
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, shorted to ground, or shorted to voltage.
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics
Connector End View Reference
Mirror Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the appropriate outside rearview mirror C5 harness connector.
- Ignition OFF, scan tool OFF, test for less than 20.0 ohms between the low reference circuit terminal 4 and ground.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the appropriate door control module. |
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door control module. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the appropriate door control module. |
- Verify with a scan tool the appropriate mirror position parameter is less than 4.5 volts.
| ⇒ | If greater than the specified range, test the appropriate mirror position signal circuit for a short to voltage. If the circuit tests normal, replace the appropriate door control module. |
- Install a 3-A fused jumper wire between the appropriate mirror position signal circuit and the 5-volt reference circuit terminal 1. Verify with a scan tool the appropriate mirror position parameter is greater than 4.5 volts.
| ⇒ | If less than the specified range, test the appropriate mirror position signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door control module. |
- If all circuits test normal, test or replace the appropriate mirror.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
