Circuit Description
The mirror horizontal and vertical position sensors are potentiometers. The Memory Mirror Module (MMM) provides these sensors with a 5 volt reference circuit and a low reference circuit. The MMM monitors the horizontal and vertical position sensor signal circuits which change values based on mirror position. These voltage values are used to determine mirror position and can be set into memory. When the MMM receives a memory recall request, the MMM will control the power mirror to the memory position based on the horizontal and vertical position sensor signal values.
Conditions for Running the DTC
Battery voltage must between 9.0-16.0 volts.
Conditions for Setting the DTC
The horizontal and/or vertical position sensor signal(s) are greater than 4.75 volts or less than 0.50 volts.
Action Taken When the DTC Sets
Memory movements on the malfunctioning axis are disabled.
Conditions for Clearing the DTC
When the fault is no longer present, the MMM changes the current DTC to a history DTC. The MMM will clear the history DTC after 50 fault free ignition cycles.
Diagnostic Aids
| • | If DTC B1586 is set by itself, the left horizontal position sensor signal circuit maybe open, shorted to ground or battery |
| • | If DTC B1596 is set by itself, the left vertical position sensor signal circuit maybe open, shorted to ground or battery |
| • | If DTC B1616 is set by itself, the right horizontal position sensor signal circuit maybe open, shorted to ground or battery |
| • | If DTC B1626 is set by itself, the right vertical position sensor signal circuit maybe open, shorted to ground or battery. |
| • | If DTCs B1586 and B1596 are both set, the left 5 volt reference or low reference circuit(s) maybe open, shorted to ground or battery. |
| • | If DTCs B1616 and B1626 are both set, the right 5 volt reference or low reference circuit(s) maybe open, shorted to ground or battery. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Door Systems Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the left and right mirror horizontal and vertical position parameters are within the specified range? | 0.50-4.75 V | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Is there a horizontal and vertical DTC set on the same mirror? | -- | Go to Step 6 | Go to Step 4 |
4 |
Does the scan tool indicate that the mirror position parameter is less than the specified value? | 0.50 V | Go to Step 5 | Go to Step 8 |
5 |
Does the scan tool indicate that the mirror position parameter is within the specified range? | 4.75 - 5.25 V | Go to Step 12 | Go to Step 9 |
6 |
Does the voltage measure within the specified range? | 4.75 - 5.25 V | Go to Step 7 | Go to Step 10 |
7 | Measure the voltage between the 5 volt reference circuit and the low reference circuit at the mirror harness connector. Does the voltage measure within the specified range? | 4.75 - 5.25 V | Go to Step 12 | Go to Step 11 |
8 | Test for a short to voltage on the mirror position signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
9 | Test the mirror position signal circuit for an open, high resistance, short to ground or battery. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
10 | Test the 5 volt reference circuit for an open, high resistance, short to ground or battery. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
11 | Test the low reference circuit for an open, high resistance or short to battery. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
12 | Inspect for poor connections at the harness connector of the power 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 16 | Go to Step 14 |
13 | Inspect for poor connections at the harness connector of the Memory Mirror Module (MMM). 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 16 | Go to Step 15 |
14 | Replace the power mirror. Refer to Outside Rearview Mirror Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
15 | Replace the Memory Mirror Module (MMM). Refer to Accessory and Outside Rearview Mirror Module Replacement Did you complete the replacement? | -- | Go to Step 16 | -- |
16 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
