Mirror System: Diagnosis Cadillac STS I facelift

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Mirrors

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information

1. The identification of the control modules which command the system
2. The ability of the control modules to communicate through the serial data circuit
3. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

A power mirror switch input to the DDSA is active for more than 30 seconds.

Action Taken When the DTC Sets

The DDSA deactivates and ignores inputs from the failed switch contacts and stops sending messages for this switch to the DDM or PDM. The DDSA will continue to respond to inputs from other non-failed switch contacts.

Conditions for Clearing the DTC

1. A current DTC will clear when the fault is no longer present.
2. A history DTC will clear after 40 malfunction-free ignition cycles.

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.

Diagnostic Fault Information

Battery voltage must be between 9-16 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground: 5-volt reference circuit terminal 7 Signal circuit terminal 2 Signal circuit terminal 3 Low reference circuit terminal 6 If the test lamp illuminates, test the appropriate circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following circuits and ground: 5-volt reference circuit terminal 7 Signal circuit terminal 2 Signal circuit terminal 3 Low reference circuit terminal 6 If less than the specified value, test the appropriate circuit for a short to ground.
4. Test for 4K-7K ohms between the 5-volt reference circuit terminal 7 and the low reference circuit terminal 6. If not within the specified range, test the 5-volt reference circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
5. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 2. If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
6. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 3. If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
7. If all circuits test normal, replace the door module.

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.

Battery voltage must be between 9-16 volts.

A power mirror fold or retract switch input to the DDSA is active for more than 30 seconds.

Power folding mirror operations are suspended as long as the fault is present.

1. A current DTC will clear when the fault is no longer present.
2. A history DTC will clear after 40 fault free ignition cycles.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «Checking Aftermarket Accessories»(ref-338151-S01119782592009081700000) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Automatic Day-Night Mirrors Inoperative (With RPO DL3/DR4)»(ref-338137-S06280370482009081700000) or «Automatic Day-Night Mirrors Inoperative (Without RPO DL3/DR4)»(ref-338137-S20046752972009081700000)
2. «Power Mirror Folding Inoperative»(ref-338137-S18737562372009081700000)
3. «Power Mirrors Inoperative»(ref-338137-S35363571792009081700000)

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the X4 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the control circuit terminal 6 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the control circuit terminal 6 and ground. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, test or replace the rearview mirror face.
4. Test for 5-10 ohms between the control circuit terminal 6 and the low reference circuit terminal 8. If not within the specified range, test the control circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror face.
5. If all circuits test normal, test or replace the door module.

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.

Inside Rearview Mirror Dimming Malfunction

1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Test for less than 10 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, Verify that a test lamp illuminates between the ignition circuit terminal 13 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the backup lamp control circuit terminal 9 and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to «Backup Lamps Malfunction»(ref-338126-S33605767572009081700000) .
5. If all circuits test normal, test or replace the inside rearview mirror.

Outside Rearview Mirror Dimming Malfunction

1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Ignition ON, verify a test lamp does not illuminate between the following circuits and ground: Signal circuit terminal 5 Low reference circuit terminal 16 If the test lamp illuminates, test the appropriate circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following circuits and ground: Signal circuit terminal 5 Low reference circuit terminal 16 If less than the specified range, test the appropriate circuit for a short to ground.
4. Test for less than 100 ohms between the signal circuit terminal 5 and the low reference circuit terminal 16. If greater than the specified range, test both circuits for an open/high resistance. If the circuit tests normal, test or replace the driver outside rearview mirror glass.
5. If all circuits test normal, replace the inside rearview mirror.

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Test for less than 10 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, Verify that a test lamp illuminates between the ignition circuit terminal 13 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the backup lamp control circuit terminal 9 and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to «Backup Lamps Malfunction»(ref-338126-S33605767572009081700000) .
5. If all circuits test normal, test or replace the inside rearview mirror.

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the X4 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground: Control circuit terminal 3 Control circuit terminal 4 If the test lamp illuminates, test the appropriate circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following circuits and ground: Control circuit terminal 3 Control circuit terminal 4 If less than the specified value, test the appropriate circuit for a short to ground. If the circuits test normal, test or replace the rearview mirror.
4. Test for 5-25 ohms between the control circuit terminal 3 and the control circuit terminal 4. If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
5. If all circuits test normal, replace the appropriate door module.

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.

Mirror Motor Circuit Test

1. Ignition OFF, disconnect the X4 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals and ground: Control circuit terminal 1 Control circuit terminal 2 Control circuit terminal 5 If the test lamp illuminates, test the appropriate control circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following control circuits and ground: Control circuit terminal 1 Control circuit terminal 2 Control circuit terminal 5
4. Test for 20-120 ohms between the control circuit terminal 1 and the control circuit terminal 2. If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
5. Test for 20-120 ohms between the control circuit terminal 5 and the control circuit terminal 2. If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
6. If all circuits test normal, replace the appropriate door module.

Mirror Position Sensor Circuit Test

1. Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground: 5-volt reference circuit terminal 7 Signal circuit terminal 2 Signal circuit terminal 3 Low reference circuit terminal 6 If the test lamp illuminates, test the appropriate circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following circuits and ground: 5-volt reference circuit terminal 7 Signal circuit terminal 2 Signal circuit terminal 3 Low reference circuit terminal 6 If less than the specified value, test the appropriate circuit for a short to ground.
4. Test for 4K-7K ohms between the 5-volt reference circuit terminal 7 and the low reference circuit terminal 6. If not within the specified range, test the 5-volt reference circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
5. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 2. If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
6. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 3. If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
7. If all circuits test normal, replace the door module.

1. Perform the «Diagnostic System Check - Vehicle»(ref-338149-S41903538652009081700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-338149-S37154416862009081700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-338149-S02595537362009081700000) provides an overview of each diagnostic category.