Mirror System: Diagnosis GMC Sierra III

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(ref-650999-S38140870152014081900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-650999-S18942452582014081900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-650999-S34767258932014081900000) provides an overview of each diagnostic category.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B154A 39

An internal malfunction has been detected by the mirror control module while commanding the driver outside rearview mirror UP, DOWN, LEFT or RIGHT.

B154B 39

An internal malfunction has been detected by the passenger window switch while commanding the passenger outside rearview mirror UP, DOWN, LEFT or RIGHT.

Action Taken When the DTC Sets

The affected outside rearview mirror will be inoperative.

Conditions for Clearing the DTC

B154A 39

The driver outside rearview mirror must be replaced before the DTC can be cleared.

B154B 39

The passenger outside rearview mirror must be replaced before the DTC can be cleared.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «Checking Aftermarket Accessories»(ref-651023-S10146574172014081900000) .
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. «Heated Mirrors Malfunction»(ref-651040-S03022715612014081900000)
2. «Automatic Day-Night Mirrors Malfunction»(ref-651040-S23188224292014081900000)
3. «Power Mirror Malfunction (Without A45)»(ref-651040-S03140097012014081900000) , «Power Mirror Malfunction (With A45)»(ref-651040-S42708411842014081900000)

1. Perform the «Diagnostic System Check - Vehicle»(ref-650999-S38140870152014081900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-650999-S18942452582014081900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-650999-S34767258932014081900000) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate E17 Outside Rearview Mirror Glass. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 11 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Connect a test lamp between the control circuit terminal 8 and ground.
4. Engine running.
5. Verify the test lamp turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool. If the lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, refer to «Rear Window Defogger Malfunction»(ref-651039-S05211154432014081900000) . If the lamp is always OFF Ignition OFF, remove the test lamp, disconnect the harness connector at X50A Fuse Block - Underhood, ignition ON. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms refer to «Rear Window Defogger Malfunction»(ref-651039-S05211154432014081900000) . If the lamp turns on and off
6. Replace the E17 Outside Rearview Mirror Glass.

1. Perform the «Diagnostic System Check - Vehicle»(ref-650999-S38140870152014081900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-650999-S18942452582014081900000) for an overview of the diagnostic approach
3. «Diagnostic Procedure Instructions»(ref-650999-S34767258932014081900000) provides an overview of each diagnostic category

Inside Review Mirror Dimming Inoperative

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A10 Inside Rearview Mirror. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF, remove the test lamp. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the ignition circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the A10 Inside Rearview Mirror If the test lamp illuminates
5. Replace the A10 Inside Rearview Mirror.

Day-Night Disable Malfunction

1. Ignition OFF, disconnect the harness connector at the A10 Inside Rearview Mirror. Ignition ON
2. Connect a test lamp between the control circuit terminal 1 and ground
3. Verify the test lamp turns ON and OFF while commanding the Backup Lamps Active and Inactive with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, refer to «Backup Lamps Malfunction (Manual Transmission)»(ref-651044-S14980850932014081900000) , «Backup Lamps Malfunction (Automatic Transmission)»(ref-651044-S07348433662014081900000) . If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, refer to «Backup Lamps Malfunction (Manual Transmission)»(ref-651044-S14980850932014081900000) , «Backup Lamps Malfunction (Automatic Transmission)»(ref-651044-S07348433662014081900000) If the test lamp turns ON and OFF
4. Replace the A10 Inside Rearview Mirror.

Outside Rearview Mirror Dimming Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A9A Outside Rearview Mirror-Driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 16 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the A10 Inside Rearview Mirror. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the A10 Inside Rearview Mirror. If less than 10 ohms
3. Ignition ON.
4. Test for less than 1 V between the control circuit terminal 2 and ground. If 1 V or greater Ignition OFF, disconnect the harness connector at the A10 Inside Rearview Mirror, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V replace the A10 Inside Rearview Mirror. If less than 1 V
5. Ignition ON, headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor.
6. Test for greater than 1 V between the control circuit terminal 2 and ground. If 1 V or less Ignition OFF, disconnect the harness connector at the A10 Inside Rearview Mirror, ignition ON. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the A10 Inside Rearview Mirror. If greater than 1 V
7. Test or replace A9A Outside Rearview Mirror-Driver.

1. Perform the «Diagnostic System Check - Vehicle»(ref-650999-S38140870152014081900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-650999-S18942452582014081900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-650999-S34767258932014081900000) provides an overview of each diagnostic category.

Diagnostic Aids

Power folding mirrors only operate when the mirror selector switch is in the no mirror select position.

Driver Outside Mirror Folding Command Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the X510 inline harness connector at the A9A Outside Rearview Mirror-Driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the control circuit terminal 4 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79D Window Switch-Driver. If less than 10 ohms
3. Test for less than 10 ohms between the control circuit terminal 18 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79D Window Switch-Driver. If less than 10 ohms
4. Connect a test lamp between control circuit terminal 4 and control circuit terminal 18, ignition ON.
5. Verify the test lamp turns ON when commanding the FOLD and UNFOLD states with a scan tool. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch-Driver. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the S79D Window Switch-Driver. If the test lamp turns ON during each of the commands
6. Test or replace the A9A Outside Rearview Mirror-Driver.

Passenger Outside Mirror Folding Command Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the X610 inline harness connector at the A9B Outside Rearview Mirror-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the control circuit terminal 4 and ground. If 10 ohms or greater Ignition OFF, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79P Window Switch-Passenger. If less than 10 ohms
3. Test for less than 10 ohms between the control circuit terminal 18 and ground. If 10 ohms or greater Ignition OFF, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79P Window Switch-Passenger. If less than 10 ohms
4. Connect a test lamp between control circuit terminal 4 and control circuit terminal 18, ignition ON.
5. Verify the test lamp turns ON when commanding the FOLD and UNFOLD states with a scan tool. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the S79P Window Switch-Passenger. If the test lamp turns ON during each of the commands
6. Test or replace the A9B Outside Rearview Mirror-Passenger.

Component Testing

Outside Rearview Mirror

1. Ignition OFF, disconnect the harness connector at the appropriate A9 Outside Rearview Mirror.
2. Install a 10 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the A9 Outside Rearview Mirror should perform the FOLD and UNFOLD functions. If the function does not perform the FOLD and UNFOLD functions Replace the A9 Outside Rearview Mirror. If the function performs the FOLD and UNFOLD functions
3. All OK

1. Perform the «Diagnostic System Check - Vehicle»(ref-650999-S38140870152014081900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-650999-S18942452582014081900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-650999-S34767258932014081900000) provides an overview of each diagnostic category.

Power folding mirrors only operate when the mirror selector switch is in the no mirror select position.

1. Ignition OFF, disconnect the inline harness connector at the appropriate M78 Outside Rearview Mirror Folding Motor. Ignition ON
2. Connect a test lamp between the control circuit terminal 4 and control circuit terminal 18.
3. Verify the test lamp turns ON when commanding the FOLD and UNFOLD states with the S52 Outside Rearview Mirror Switch. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the S52 Outside Rearview Mirror Switch. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the S52 Outside Rearview Mirror Switch If the test lamp turns ON during each of the commands
4. Test or replace the A9 Outside Rearview Mirror.

1. Perform the «Diagnostic System Check - Vehicle»(ref-650999-S38140870152014081900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-650999-S18942452582014081900000) for an overview of the diagnostic approach
3. «Diagnostic Procedure Instructions»(ref-650999-S34767258932014081900000) provides an overview of each diagnostic category

Both Outside Rearview Mirrors Inoperative

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Verify a test lamp illuminates between the B+ circuit terminal 12 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for infinite resistance between each of the control circuit terminals listed below and ground: Control circuit terminal 1 Control circuit terminal 3 Control circuit terminal 4 Control circuit terminal 7 Control circuit terminal 8 Control circuit terminal 10 If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the appropriate M77 Outside Rearview Mirror Motor. If the test lamp illuminates
4. Test or replace the S52 Outside Rearview Mirror Switch.

Driver Outside Mirror Movement Malfunction

1. Ignition OFF, disconnect the X510 inline harness connector at the A9A Outside Rearview Mirror-Driver. Ignition ON
2. Connect a test lamp between the control circuit terminal 9 and control circuit terminal 10.
3. Verify the test lamp turns ON when commanding the UP and DOWN states with the S52 Outside Rearview Mirror Switch. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the S52 Outside Rearview Mirror Switch. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the S52 Outside Rearview Mirror Switch If the test lamp turns ON during each of the commands
4. Connect a test lamp between the control circuit terminal 10 and control circuit terminal 12.
5. Verify the test lamp turns ON when commanding the LEFT and RIGHT states with the S52 Outside Rearview Mirror Switch. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the S52 Outside Rearview Mirror Switch. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the S52 Outside Rearview Mirror Switch If the test lamp turns ON during each of the commands
6. Test or replace the M77D Outside Rearview Mirror Motor-Driver.

Passenger Outside Mirror Movement Malfunction

1. Ignition OFF, disconnect the X610 inline harness connector at the A9B Outside Rearview Mirror-Passenger. Ignition ON
2. Connect a test lamp between the control circuit terminal 12 and control circuit terminal 9.
3. Verify the test lamp turns ON when commanding the UP and DOWN states with the S52 Outside Rearview Mirror Switch. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the S52 Outside Rearview Mirror Switch. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the S52 Outside Rearview Mirror Switch If the test lamp turns ON during each of the commands
4. Connect a test lamp between the control circuit terminal 12 and control circuit terminal 10.
5. Verify the test lamp turns ON when commanding the LEFT and RIGHT states with the S52 Outside Rearview Mirror Switch. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the S52 Outside Rearview Mirror Switch. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the S52 Outside Rearview Mirror Switch, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the S52 Outside Rearview Mirror Switch If the test lamp turns ON during each of the commands
6. Test or replace the M77P Outside Rearview Mirror Motor-Passenger.

1. Perform the «Diagnostic System Check - Vehicle»(ref-650999-S38140870152014081900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-650999-S18942452582014081900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-650999-S34767258932014081900000) provides an overview of each diagnostic category.

Driver Outside Mirror Movement Malfunction

1. Ignition OFF, disconnect the X510 inline harness connector at the A9A Outside Rearview Mirror-Driver. Ignition ON
2. Connect a test lamp between the control circuit terminal 12 and control circuit terminal 9.
3. Verify the test lamp turns ON when commanding the Up and Down states with a scan tool. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the S79D Window Switch-Driver. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79D Window Switch-Driver. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the S79D Window Switch-Driver, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79D Window Switch-Driver If the test lamp turns ON during each of the commands
4. Connect a test lamp between the control circuit terminal 12 and control circuit terminal 10.
5. Verify the test lamp turns ON when commanding the Left and Right states with a scan tool. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the S79D Window Switch-Driver. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79D Window Switch-Driver. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the S79D Window Switch-Driver, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79D Window Switch-Driver If the test lamp turns ON during each of the commands
6. Test or replace the M77D Outside Rearview Mirror Motor-Driver.

Driver Mirror Position Sensor Circuit Test

1. Ignition OFF and all vehicle systems OFF, disconnect the X510 inline harness connector at the A9A Outside Rearview Mirror-Driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 3 and ground. If 10 ohms or greater Ignition OFF, disconnect the X1 harness connector at the S79D Window Switch-Driver. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79D Window Switch-Driver. If less than 10 ohms
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 17 and ground. If less than 4.8 V Ignition OFF, disconnect the X1 harness connector at the S79D Window Switch-Driver. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79D Window Switch-Driver. If greater than 5.2 V Ignition OFF, disconnect the X1 harness connector at the S79D Window Switch-Driver, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79D Window Switch-Driver. If between 4.8-5.2 V
5. Verify the scan tool Driver Mirror Vertical Position parameter is less than 4.6 V. If 4.6 V or greater Ignition OFF, disconnect the X1 harness connector at the S79D Window Switch-Driver, ignition ON. Test for less than 1 V between the signal circuit terminal 14 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79D Window Switch-Driver. If less than 4.6 V
6. Install a 3 A fused jumper wire between the signal circuit terminal 14 and the 5 V reference circuit terminal 17.
7. Verify the scan tool Driver Mirror Vertical Position or the parameter is greater than 0.6 V. If 0.6 V or less Ignition OFF, remove the jumper wire, disconnect the X1 harness connector at the S79D Window Switch-Driver. Test for infinite resistance between the signal circuit terminal 14 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79D Window Switch-Driver. If greater than 0.6 V
8. Verify the scan tool Driver Mirror Horizontal Position parameter is less than 4.6 V. If 4.6 V or greater Ignition OFF, disconnect the X1 harness connector at the S79D Window Switch-Driver, ignition ON. Test for less than 1 V between the signal circuit terminal 7 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79D Window Switch-Driver. If less than 4.6 V
9. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the 5 V reference circuit terminal 17.
10. Verify the scan tool Driver Mirror Horizontal Position or the parameter is greater than 0.6 V. If 0.6 V or less Ignition OFF, remove the jumper wire, disconnect the X1 harness connector at the S79D Window Switch-Driver. Test for infinite resistance between the signal circuit terminal 7 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79D Window Switch-Driver. If greater than 0.6 V
11. Test or replace the M77D Outside Rearview Mirror Motor-Driver.

Passenger Outside Mirror Movement Malfunction

1. Ignition OFF, disconnect the X610 inline harness connector at the A9B Outside Rearview Mirror-Passenger. Ignition ON
2. Connect a test lamp between the control circuit terminal 12 and control circuit terminal 9.
3. Verify the test lamp turns ON when commanding the Up and Down states with a scan tool. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79P Window Switch-Passenger. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the X2 harness connector at the S79P Window Switch-Passenger, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79P Window Switch-Passenger If the test lamp turns ON during each of the commands
4. Connect a test lamp between the control circuit terminal 12 and control circuit terminal 10.
5. Verify the test lamp turns ON when commanding the Left and Right states with a scan tool. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79P Window Switch-Passenger. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the X2 harness connector at the S79P Window Switch-Passenger, ignition ON. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79P Window Switch-Passenger If the test lamp turns ON during each of the commands
6. Test or replace the M77P Outside Rearview Mirror Motor-Passenger.

Passenger Mirror Position Sensor Circuit Test

1. Ignition OFF and all vehicle systems OFF, disconnect the X610 inline harness connector at the A9B Outside Rearview Mirror-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 3 and ground. If 10 ohms or greater Ignition OFF, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79P Window Switch-Passenger. If less than 10 ohms
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 17 and ground. If less than 4.8 V Ignition OFF, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79P Window Switch-Passenger. If greater than 5.2 V Ignition OFF, disconnect the X2 harness connector at the S79P Window Switch-Passenger, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79P Window Switch-Passenger. If between 4.8-5.2 V
5. Verify the scan tool Passenger Mirror Vertical Position parameter is less than 4.6 V. If 4.6 V or greater Ignition OFF, disconnect the X2 harness connector at the S79P Window Switch-Passenger, ignition ON. Test for less than 1 V between the signal circuit terminal 14 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79P Window Switch-Passenger. If less than 4.6 V
6. Install a 3 A fused jumper wire between the signal circuit terminal 14 and the 5 V reference circuit terminal 17.
7. Verify the scan tool Passenger Mirror Vertical Position or the parameter is greater than 0.6 V. If 0.6 V or less Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for infinite resistance between the signal circuit terminal 14 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79P Window Switch-Passenger. If greater than 0.6 V
8. Verify the scan tool Passenger Mirror Horizontal Position parameter is less than 4.6 V. If 4.6 V or greater Ignition OFF, disconnect the X2 harness connector at the S79P Window Switch-Passenger, ignition ON. Test for less than 1 V between the signal circuit terminal 7 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79P Window Switch-Passenger. If less than 4.6 V
9. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the 5 V reference circuit terminal 17.
10. Verify the scan tool Passenger Mirror Horizontal Position or the parameter is greater than 0.6 V. If 0.6 V or less Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the S79P Window Switch-Passenger. Test for infinite resistance between the signal circuit terminal 7 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79P Window Switch-Passenger. If greater than 0.6 V
11. Test or replace the M77P Outside Rearview Mirror Motor-Passenger.

1. Perform the «Diagnostic System Check - Vehicle»(ref-650999-S38140870152014081900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-650999-S18942452582014081900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-650999-S34767258932014081900000) provides an overview of each diagnostic category.

The Park Tilt Mirror in Reverse is a feature in the Personalization Menu of the audio system controls that allows the operator to program the driver and/or passenger outside rearview mirrors to tilt downward when the vehicle is shifted into R (reverse). Verify that this feature has been correctly programmed into the system before performing extensive diagnostics

1. Engine running, shift the vehicle in REVERSE.
2. Verify that the appropriate A9 Outside Rearview Mirror moves DOWN. If the A9 Outside Rearview Mirror does not move DOWN Replace the K40 Seat Memory Control Module If the A9 Outside Rearview Mirror does move DOWN
3. All OK.