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.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Outside Rearview Mirror Schematics and Door Control Module Schematics Connector End View Reference: Power Door Systems Connector End Views | ||||
1 | Did you perform the Vehicle Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool indicate that the mirror position parameter is within the specified range? | 0.5-4.5 V | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | |
3 | Disconnect the appropriate outside rearview mirror C2 harness connector. Does the scan tool indicate that the mirror position parameter is greater than specified? | 4.5 V | Go to Step 8 | Go to Step 4 |
4 | Measure the voltage from the 5 volt reference circuit of the door harness connector to a good ground. Does the voltage measure near the specified value? | 5.0 V | Go to Step 6 | Go to Step 5 |
5 | Does the voltage measure greater than the specified value? | 5.0 V | Go to Step 9 | Go to Step 10 |
6 | Measure the voltage between the 5 volt reference circuit and the low reference circuit of the door harness connector. Does the voltage measure near the specified value? | 5.0 V | Go to Step 7 | Go to Step 11 |
7 | Connect a 3 amp fused jumper wire between the 5 volt reference circuit and the appropriate signal circuit of the door harness connector. Does the scan tool indicate that the mirror position parameter is greater than specified? | 4.5 V | Go to Step 13 | Go to Step 12 |
8 | Test the appropriate mirror position signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 |
9 | Test the appropriate 5 volt reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 |
10 | Test the appropriate 5 volt reference circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 |
11 | Test the appropriate low reference circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 |
12 | Test the appropriate mirror position signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 |
13 | Inspect for poor connections at the harness connectors of the appropriate mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 15 |
14 | Inspect for poor connections at the harness connector of the appropriate door module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 16 |
15 | Replace the appropriate mirror. Refer to Outside Rearview Mirror Replacement . Did you complete the replacement? | -- | Go to Step 17 | -- |
16 |
Did you complete the replacement? | -- | Go to Step 17 | -- |
17 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
