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.
If the mirror 5-volt reference voltage is closest to: | The code will be set when the sensor signal voltage is: | The code will be set when the sensor signal voltage is: |
|---|---|---|
5.0 V | 0-0.60 V | 4.7-5.0 V |
4.4 V | 0-0.53 V | 4.1-4.4 V |
3.8 V | 0-0.45 V | 3.6-3.8 V |
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
The numbers below refer to the step numbers on the diagnostic table.
-
This step verifies the integrity of the mirror 5-volt reference circuit.
-
This step verifies that the mirror position sensor low reference circuit is not open.
-
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.
-
This step verifies that the door module recognizes the vertical position sensor signal circuit voltage being pulled to ground.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Outside Rearview Mirror Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 | Is the vehicle equipped with the A45 memory option? | -- | Go to Step 4 | Go to Step 3 |
3 |
Did you complete the deactivation? | -- | Go to Step 19 | |
4 |
Does the scan tool indicate that the voltage increases with the up adjustments and decreases with the down adjustments and is within the specified range? | 0.25-5.0 V | Go to Step 19 | Go to Step 5 |
Was the measured voltage within the specified range? | 3.5-5.0 V | Go to Step 6 | Go to Step 10 | |
Measure the voltage between the 5-volt reference circuit and the low reference circuit of the harness connector. Was the measured voltage within the specified range? | 3.5-5.0 V | Go to Step 7 | Go to Step 14 | |
Measure the voltage between the mirror vertical position sensor signal circuit and the low reference circuit of the harness connector. Was the measured voltage within the specified range? | 3.5-5.0 V | Go to Step 9 | Go to Step 8 | |
8 | Was the measured voltage in step 7 less than specified range? | 3.5-5.0 V | Go to Step 12 | Go to Step 13 |
Does the scan tool indicate the voltage is within the specified range? | 0-0.75 V | Go to Step 15 | Go to Step 16 | |
10 | Test the 5-volt reference circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 11 |
11 | Test the 5-volt reference circuit for a short to voltage or a short to any other circuit in the harness connector. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 16 |
12 | Test the vertical position sensor signal circuit for a short to ground, an open, or a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 16 |
13 | Test the vertical position sensor signal circuit for a short to voltage or a short to any other circuit in the harness connector. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 16 |
14 | Test the low reference circuit for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 16 |
15 | Inspect for poor connections at the harness connector of the inoperative mirror motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 17 |
16 | Inspect for poor connections at the C5 harness connector of the door module associated with the inoperative mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 18 |
17 | Replace the inoperative mirror motor. Refer to Outside Rearview Mirror Motor Replacement . Did you complete the replacement? | -- | Go to Step 19 | -- |
18 | Replace the door module. Refer to Control Module References . Did you complete the replacement? | -- | Go to Step 19 | -- |
19 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
