Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
DTC B1586, B1596, B1616, or B1626
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Did you perform the Door Systems Diagnostic System Check? | - | Go to Step 2 | Go to Diagnostic System Check - Door Systems |
| 2 |
|
0.50-4.75 V | Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS | 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 |
|
0.50 V | Go to Step 5 | Go to Step 8 |
| 5 |
|
4.75 - 5.25 V | Go to Step 12 | Go to Step 9 |
| 6 |
|
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
. 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
. 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
. 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
. 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 AND POOR CONNECTIONS
and CONNECTOR REPAIRS
. 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 AND POOR CONNECTIONS
and CONNECTOR REPAIRS
. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 15 |
| 14 | Replace the power mirror. Refer to Mirror Replacement (Power Mirror) or Mirror Replacement (Manual) . Did you complete the replacement? |
- | Go to Step 16 | - |
| 15 | Replace the Memory Mirror Module (MMM). Refer to Accessory and Outside Rear View Mirror Module Replacement Did you complete the replacement? |
- | Go to Step 16 | - |
| 16 |
|
- | Go to Step 2 | System OK |