Power Mirror Control (Diagnostics): Overview Lexus RX III

SYSTEM DESCRIPTION

1. POWER MIRROR CONTROL SYSTEM DESCRIPTION This system has the following functions: automatic glare-resistant electrochromic (EC) mirror function, auto electric retract function, reverse shift-linked function, electrical remote control function, memory function and mirror heater function.
2. FUNCTION OF MAIN COMPONENT Component Function Vertical mirror motor Receives a signal from the outer mirror control ECU assembly and adjusts the mirror surface position vertically. Horizontal mirror motor Receives a signal from the outer mirror control ECU assembly and adjusts the mirror surface position horizontally. Power retract mirror motor Receives a signal from the outer mirror control ECU assembly, and retracts and returns the outer rear view mirrors. Mirror heater Receives a signal from the outer mirror control ECU assembly and operates mirror heater EC mirror cell Varies reflection rate of the mirror through function of EC elements. Outer mirror retract switch Retracts and returns the outer rear view mirrors. Mirror retract and return signals are sent to each outer mirror control ECU assemblies from the main body ECU (multiplex network body ECU). Mirror auto retract switch Built into the multiplex network master switch and sends the mirror AUTO retract switch signal to the main body ECU (multiplex network body ECU) via LIN communication. Mirror select switch Consists of R and L switches. One must be chosen to operate the outer mirror switch assembly. Mirror adjust switch Mirror R and L signals are sent to each outer mirror control ECU assemblies from the mirror select switch. After selecting the R or L switch, the right, left, up and down control switches can be operated to change the angle of the mirror. Mirror position sensor Detects the mirror surface position. This data is detected by the outer mirror control ECU assembly. Seat memory switch When the seat memory M1, M2 or M3 switch are pressed while the SET switch is being pressed, or M1, M2 or M3 switch is pressed within 3 seconds after the SET switch being pressed, a signal is input to the outer mirror control ECU assembly (driver side), which records the mirror surface position. When the seat memory switch is pressed, a signal is input to the outer mirror control ECU assembly (driver side) and sent to main body ECU (multiplex network body ECU), which changes the mirror surface position to the recorded position. Outer mirror control ECU assembly Operates each mirror motor based on signals from the outer mirror retract switch, mirror select switch and mirror adjust switch. Based on information from the mirror position sensor, 3 different mirror surface positions can be stored. By operating a seat memory switch, the mirror surface moves to the stored position.
3. SYSTEM OPERATION The remote control mirror has the following features. Function Outline Power retract mirror function Retracts and returns the outer rear view mirrors when the outer mirror retract switch is pressed. AUTO power retract mirror function Retracts and returns each outer rear view mirror together with the following operations while the mirror AUTO retract switch is on. Manual lock/unlock Key-linked lock/unlock Wireless door lock/unlock Wireless 30 seconds auto lock Entry lock/unlock Smart 30 seconds auto lock Reverse shift-linked function of mirrors Directs the mirror surface downward to improve visibility when driving in reverse and all the conditions below are met: The engine switch is on (IG). Shift lever is moved to R. The mirror select switch is in the R or L position. Electrical remote control mirror function When the outer mirror switch assembly is operated, this function moves the mirror surface vertically or horizontally to enable the driver to attain an optimal mirror angle. Setting the mirror select switch to the R position operates the right mirror, and setting it to the L position operates the left mirror. Memory and reactivation function Stores the adjusted mirror position in the outer mirror control ECU assembly. Automatic glare-resistant EC mirror function Reduces glare/reflection in the mirror during nighttime driving for safe driving conditions. Glare/reflection from vehicle headlights behind could blind driver and cause dangerous driving conditions. Mirror heater function Automatically turns on mirror heater when the rear window defogger switch is turned on. The rear window defogger and mirror heaters automatically turn off after 15 min.

When the mirror adjust switch is operated, the multiplex network master switch assembly detects the switch operation and sends the mirror adjust switch signal to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the mirror adjust switch signal to the outer mirror control ECU assembly (driver side) via CAN communication. On receiving the signal, the outer mirror control ECU assembly (driver side) operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly LH, to adjust the mirror surface position.

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1. CHECK CAN COMMUNICATION SYSTEM Check for CAN communication system DTCs. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING». OK CAN communication DTC is not output. NG --> See step 5 OK: Go to next step
2. READ VALUE USING TECHSTREAM (OUTER MIRROR SWITCH ASSEMBLY) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Master Switch / Data List. Read the Data List according to the display on the Techstream. MASTER SWITCH Tester Display Measurement Item/Range Normal Condition Diagnostic Note Mirror Selection SW (L) Mirror select switch signal for LH mirror / ON or OFF ON: Switch in L position OFF: Switch off or in R position - Mirror Position SW (R) Mirror adjust switch signal (right) / ON or OFF ON: Mirror adjust switch pressed right OFF: Mirror adjust switch not pressed right Check with the mirror select switch in the L position. Mirror Position SW (L) Mirror adjust switch signal (left) / ON or OFF ON: Mirror adjust switch pressed left OFF: Mirror adjust switch not pressed left Check with the mirror select switch in the L position. Mirror Position SW (Up) Mirror adjust switch signal (up) / ON or OFF ON: Mirror adjust switch pressed up OFF: Mirror adjust switch not pressed up Check with the mirror select switch in the L position. Mirror Position SW (Dwn) Mirror adjust switch signal (down) / ON or OFF ON: Mirror adjust switch pressed down OFF: Mirror adjust switch not pressed down Check with the mirror select switch in the L position. OK On the Techstream screen, ON or OFF is displayed for each item according to the table above. NG --> See step 6 OK: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (POWER MIRROR CONTROL FUNCTION) Enter the following menus: Body Electrical / Mirror L / Active Test. Perform the Active Test according to the display on the Techstream. MIRROR L Tester Display Test Part Control Range Diagnostic Note Mirror Up/Down Mirror vertical operation Up / Down - Mirror Right/Left Mirror horizontal operation Right / Left - OK Power mirror operation is normal. NG --> See step 4 OK --> See step 7
4. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH Remove the outer rear view mirror assembly LH. Refer to «REMOVAL». Apply battery voltage and check the operation of the outer rear view mirror assembly LH. OK Measurement Condition Specified Condition Battery positive (+) --> Terminal z4-1 (LMVR) Battery negative (-) --> Terminal z4-10 (LM+R) Turns upward Battery negative (-) --> Terminal z4-1 (LMVR) Battery positive (+) --> Terminal z4-10 (LM+R) Turns downward Battery positive (+) --> Terminal z4-9 (LMHR) Battery negative (-) --> Terminal z4-10 (LM+R) Turns left Battery negative (-) --> Terminal z4-9 (LMHR) Battery positive (+) --> Terminal z4-10 (LM+R) Turns right TEXT IN ILLUSTRATION *1 Component without harness connected (Outer Rear View Mirror Assembly) NG --> See step 8 OK --> See step 9
5. GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART). Refer to «DIAGNOSTIC TROUBLE CODE CHART»
6. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to «REMOVAL»
7. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER SIDE). Refer to «REMOVAL»
8. REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH. Refer to «REMOVAL»
9. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER SIDE). Refer to «REMOVAL»

When the mirror adjust switch is operated, the multiplex network master switch assembly detects the switch operation and sends the mirror adjust switch signal to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the mirror adjust switch signal to the outer mirror control ECU assembly (driver side) via CAN communication. On receiving the signal, the outer mirror control ECU assembly (driver side) operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly LH, to adjust the mirror surface position.

When the mirror adjust switch is operated, the multiplex network master switch assembly detects the switch operation and sends the mirror adjust switch signal to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the mirror adjust switch signal to the outer mirror control ECU assembly (front passenger side) via CAN communication. On receiving the signal, the outer mirror control ECU assembly (front passenger side) operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly RH, to adjust the mirror surface position.

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1. CHECK CAN COMMUNICATION SYSTEM Use the Techstream to check if the CAN communication system is functioning normally. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING». OK Multiplex communication DTC is not output. NG --> See step 5 OK: Go to next step
2. READ VALUE USING TECHSTREAM (OUTER MIRROR SWITCH) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Master Switch / Data List. Read the Data List according to the display on the Techstream. MASTER SWITCH Tester Display Measurement Item/Range Normal Condition Diagnostic Note Mirror Selection SW (R) Mirror select switch signal for RH mirror / ON or OFF ON: Switch in R position OFF: Switch off or in L position - Mirror Position SW (R) Mirror adjust switch signal (right) / ON or OFF ON: Mirror adjust switch pressed right OFF: Mirror adjust switch not pressed right Check with the mirror select switch in the R position Mirror Position SW (L) Mirror adjust switch signal (left) / ON or OFF ON: Mirror adjust switch pressed left OFF: Mirror adjust switch not pressed left Check with the mirror select switch in the R position Mirror Position SW (Up) Mirror adjust switch signal (up) / ON or OFF ON: Mirror adjust switch pressed up OFF: Mirror adjust switch not pressed up Check with the mirror select switch in the R position Mirror Position SW (Dwn) Mirror adjust switch signal (down) / ON or OFF ON: Mirror adjust switch pressed down OFF: Mirror adjust switch not pressed down Check with the mirror select switch in the R position OK On the Techstream screen, ON or OFF is displayed for each item according to the table above. NG --> See step 6 OK: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (POWER MIRROR CONTROL FUNCTION) Enter the following menus: Body Electrical / Mirror R / Active Test. Perform the Active Test according to the display on the Techstream. MIRROR R Tester Display Test Part Control Range Diagnostic Note Mirror Up/Down Mirror vertical operation Up / Down - Mirror Right/Left Mirror horizontal operation Right / Left - OK Power mirror operation is normal. NG --> See step 4 OK --> See step 7
4. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH Remove the outer rear view mirror assembly RH. Refer to «REMOVAL». Apply battery voltage and check the operation of the outer rear view mirror assembly RH. OK Measurement Condition Specified Condition Battery positive (+) --> Terminal z3-1 (RMVR) Battery negative (-) --> Terminal z3-10 (RM+R) Turns upward Battery negative (-) --> Terminal z3-1 (RMVR) Battery positive (+) --> Terminal z3-10 (RM+R) Turns downward Battery positive (+) --> Terminal z3-9 (RMHR) Battery negative (-) --> Terminal z3-10 (RM+R) Turns left Battery negative (-) --> Terminal z3-9 (RMHR) Battery positive (+) --> Terminal z3-10 (RM+R) Turns right TEXT IN ILLUSTRATION *1 Component without harness connected (Outer Rear View Mirror Assembly RH) NG --> See step 8 OK --> See step 9
5. GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART). Refer to «DIAGNOSTIC TROUBLE CODE CHART»
6. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to «REMOVAL»
7. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER SIDE). Refer to «REMOVAL»
8. REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to «REMOVAL»
9. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER SIDE). Refer to «REMOVAL»

When the mirror adjust switch is operated, the multiplex network master switch assembly detects the switch operation and sends the mirror adjust switch signal to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the mirror adjust switch signal to the outer mirror control ECU assembly (front passenger side) via CAN communication. On receiving the signal, the outer mirror control ECU assembly (front passenger side) operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly RH, to adjust the mirror surface position.

The multiplex network master switch assembly detects the mirror adjust switch status and sends the signal to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the mirror adjust switch signal to each outer mirror control ECU assembly (both driver and front passenger sides) via CAN communication. On receiving the signal, each outer mirror control ECU assembly operates the vertical and horizontal mirror motors to adjust the mirror surface position.

Scheme 10

The multiplex network master switch assembly detects the mirror adjust switch status and sends the signal to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the mirror adjust switch signal to each outer mirror control ECU assembly (both driver and front passenger sides) via CAN communication. On receiving the signal, each outer mirror control ECU assembly operates the vertical and horizontal mirror motors to adjust the mirror surface position.

DESCRIPTION

When the rear defogger switch is operated, the mirror heater signal is sent to the air conditioning amplifier assembly and then to each outer mirror control ECU assembly via CAN communication. Based on the signal, each outer mirror control ECU assembly operates the mirror heater.

Scheme 11

When the rear defogger switch is operated, the mirror heater signal is sent to the air conditioning amplifier assembly and then to each outer mirror control ECU assembly via CAN communication. Based on the signal, each outer mirror control ECU assembly operates the mirror heater.

The main body ECU (multiplex network body ECU) receives the outer mirror retract switch signal from the multiplex network master switch assembly via LIN communication. The main body ECU then sends the mirror retract/return signal to each outer mirror control ECU assembly via CAN communication. Based on the signal, each outer mirror control ECU assembly retracts or returns the outer rear view mirror assembly.

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1. CHECK CAN COMMUNICATION SYSTEM Use the Techstream to check if the CAN communication system is functioning normally. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING». OK CAN communication DTC is not output. NG --> See step 9 OK: Go to next step
2. CHECK LIN COMMUNICATION SYSTEM Use the Techstream to check if the LIN communication system is functioning normally. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING». OK LIN communication DTC is not output. NG --> See step 10 OK: Go to next step
3. READ VALUE USING TECHSTREAM (OUTER MIRROR RETRACT SWITCH) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Master Switch / Data List. Read the Data List according to the display on the Techstream. MASTER SWITCH Tester Display Measurement Item/Range Normal Condition Diagnostic Note Outer Mirror Fold SW Mirror retract switch signal / ON or OFF ON: Retract switch in retract position OFF: Retract switch in driving position - OK On the Techstream screen, ON or OFF is displayed for each item according to the above. NG --> See step 11 OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (MIRROR RETRACT FUNCTION) Enter the following menus: Body Electrical / Mirror L or Mirror R / Active Test. Perform the Active Test according to the display on the Techstream. MIRROR L / MIRROR R Tester Display Test Part Control Range Diagnostic Note Mirror Fold/Return Mirror retract operation ON / OFF - Result Result Proceed to Outer rear view mirror assemblies operate normally A Outer rear view mirror assembly RH does not operate normally B Outer rear view mirror assembly LH does not operate normally C C --> See step 8 B --> See step 7 A: Go to next step
5. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Replace main body ECU (multiplex network body ECU). Refer to «REMOVAL». NEXT: Go to next step
6. CHECK POWER RETRACT MIRROR FUNCTION Check power retract mirror function (manual function). Refer to «OPERATION CHECK». OK Power retract mirror function (manual function) is normal. NG --> See step 12 OK --> END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE)
7. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH Remove the outer rear view mirror assembly RH. Refer to «REMOVAL». When checking each mirror position, set the mirror position by hand. Apply battery voltage and check the mirror movement. NOTE: Disconnect and reconnect the battery for each mirror position check. The mirror position cannot be changed manually when the battery is connected. To change the mirror position manually, the battery must be disconnected first. OK Measurement Condition Mirror Position Specified Condition Battery positive (+) --> Terminal z3-3 (MR+) Battery negative (-) --> Terminal z3-11 (MR-) Forward position (A) Moves from (A) to retracted position (E) Battery negative (-) --> Terminal z3-3 (MR+) Battery positive (+) --> Terminal z3-11 (MR-) Forward position (A) Does not move Battery positive (+) --> Terminal z3-3 (MR+) Battery negative (-) --> Terminal z3-11 (MR-) Between forward position (A) and driving position (C) Moves from (B) to retracted position (E) Battery negative (-) --> Terminal z3-3 (MR+) Battery positive (+) --> Terminal z3-11 (MR-) Between forward position (A) and driving position (C) Moves from (B) to forward position (A) Battery positive (+) --> Terminal z3-3 (MR+) Battery negative (-) --> Terminal z3-11 (MR-) Driving position (C) Moves from (C) to retracted position (E) Battery negative (-) --> Terminal z3-3 (MR+) Battery positive (+) --> Terminal z3-11 (MR-) Driving position (C) Does not move Battery positive (+) --> Terminal z3-3 (MR+) Battery negative (-) --> Terminal z3-11 (MR-) Between driving position (C) and retracted position (E) Moves from (D) to retracted position (E) Battery negative (-) --> Terminal z3-3 (MR+) Battery positive (+) --> Terminal z3-11 (MR-) Between driving position (C) and retracted position (E) Moves from (D) to driving position (C) Battery positive (+) --> Terminal z3-3 (MR+) Battery negative (-) --> Terminal z3-11 (MR-) Retracted position (E) Does not move Battery negative (-) --> Terminal z3-3 (MR+) Battery positive (+) --> Terminal z3-11 (MR-) Retracted position (E) Moves from (E) to driving position (C) NG --> See step 13 OK --> See step 14
8. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH Remove the outer rear view mirror assembly LH. Refer to «REMOVAL». When checking each mirror position, set the mirror position by hand. Apply battery voltage and check the mirror movement. NOTE: Disconnect and reconnect the battery for each mirror position check. The mirror position cannot be changed manually when the battery is connected. To change the mirror position manually, the battery must be disconnected first. OK Measurement Condition Mirror Position Specified Condition Battery positive (+) --> Terminal z4-3 (MR+) Battery negative (-) --> Terminal z4-11 (MR-) Forward position (A) Moves from (A) to retracted position (E) Battery negative (-) --> Terminal z4-3 (MR+) Battery positive (+) --> Terminal z4-11 (MR-) Forward position (A) Does not move Battery positive (+) --> Terminal z4-3 (MR+) Battery negative (-) --> Terminal z4-11 (MR-) Between forward position (A) and driving position (C) Moves from (B) to retracted position (E) Battery negative (-) --> Terminal z4-3 (MR+) Battery positive (+) --> Terminal z4-11 (MR-) Between forward position (A) and driving position (C) Moves from (B) to forward position (A) Battery positive (+) --> Terminal z4-3 (MR+) Battery negative (-) --> Terminal z4-11 (MR-) Driving position (C) Moves from (C) to retracted position (E) Battery negative (-) --> Terminal z4-3 (MR+) Battery positive (+) --> Terminal z4-11 (MR-) Driving position (C) Does not move Battery positive (+) --> Terminal z4-3 (MR+) Battery negative (-) --> Terminal z4-11 (MR-) Between driving position (C) and retracted position (E) Moves from (D) to retracted position (E) Battery negative (-) --> Terminal z4-3 (MR+) Battery positive (+) --> Terminal z4-11 (MR-) Between driving position (C) and retracted position (E) Moves from (D) to driving position (C) Battery positive (+) --> Terminal z4-3 (MR+) Battery negative (-) --> Terminal z4-11 (MR-) Retracted position (E) Does not move Battery negative (-) --> Terminal z4-3 (MR+) Battery positive (+) --> Terminal z4-11 (MR-) Retracted position (E) Moves from (E) to driving position (C) NG --> See step 15 OK --> See step 16
9. GO TO CAN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»
10. GO TO LIN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»
11. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to «REMOVAL»
12. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to «REMOVAL»
13. REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to «REMOVAL»
14. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER SIDE). Refer to «REMOVAL»
15. REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH. Refer to «REMOVAL»
16. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER SIDE). Refer to «REMOVAL»

The main body ECU (multiplex network body ECU) receives the outer mirror retract switch signal from the multiplex network master switch assembly via LIN communication. The main body ECU then sends the mirror retract/return signal to each outer mirror control ECU assembly via CAN communication. Based on the signal, each outer mirror control ECU assembly retracts or returns the outer rear view mirror assembly.

When the mirror AUTO retract switch of the multiplex network master switch assembly is on, the multiplex network master switch sends the mirror AUTO retract switch signal to the main body ECU (multiplex network body ECU) via LIN communication. When the doors are locked or unlocked while the engine switch is off, the main body ECU (multiplex network body ECU) sends the mirror retract/return signal to each outer mirror control ECU assembly via CAN communication. On receiving the mirror retract/return signal, each outer mirror control ECU assembly operates the power mirror retract motor of the outer rear view mirror assembly to retract or return the outer rear view mirror assembly.

Scheme 15

When the mirror AUTO retract switch of the multiplex network master switch assembly is on, the multiplex network master switch sends the mirror AUTO retract switch signal to the main body ECU (multiplex network body ECU) via LIN communication. When the doors are locked or unlocked while the engine switch is off, the main body ECU (multiplex network body ECU) sends the mirror retract/return signal to each outer mirror control ECU assembly via CAN communication. On receiving the mirror retract/return signal, each outer mirror control ECU assembly operates the power mirror retract motor of the outer rear view mirror assembly to retract or return the outer rear view mirror assembly.

If any of the M1, M2 or M3 seat memory switches is pressed, the outer mirror control ECU assembly (driver side) detects the switch operation and sends the seat memory switch signal to the main body ECU (multiplex network body ECU) via CAN communication. On receiving the seat memory switch signal, the main body ECU (multiplex network body ECU) sends the memory request signal to each outer mirror control ECU assembly via CAN communication. When receiving this signal, each outer mirror control ECU assembly stores the mirror surface position based on information from the mirror position sensor, which is built into the outer rear view mirror assembly.

HINT

Each outer rear view mirror has a built-in mirror vertical position sensor and mirror horizontal position sensor.

Note. The mirror surface position will not be memorized if the engine switch is not on (IG). The mirror surface position will not be stored if the seat memory SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously. If the operation fails, the mirror surface position will not be memorized until the seat memory SET switch is turned off. The mirror surface position will not be memorized when the mirror is operated manually.

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1. CHECK CAN COMMUNICATION SYSTEM Use the Techstream to check if the CAN communication system is functioning normally. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING». OK CAN communication DTC is not output. NG --> See step 11 OK: Go to next step
2. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Mirror L / Data List. Read the Data List according to the display on the Techstream. MIRROR L Tester Display Measurement Item/Range Normal Condition Diagnostic Note Seat Memory Switch1 Seat memory switch M1 signal/ ON or OFF ON: Seat memory switch M1 on OFF: Seat memory switch M1 on - Seat Memory Switch2 Seat memory switch M2 signal/ ON or OFF ON: Seat memory switch M2 on OFF: Seat memory switch M2 on - Seat Memory Switch3 Seat memory switch M3 signal/ ON or OFF ON: Seat memory switch M3 on OFF: Seat memory switch M3 on - Seat Memory Set SW Seat memory switch SET signal/ ON or OFF ON: Seat memory switch SET on OFF: Seat memory switch SET on - OK The Techstream display changes between ON and OFF according to the switch operations. NG --> See step 5 OK: Go to next step
3. CHECK SEAT MEMORY SWITCH FUNCTION When any seat memory switch (M1, M2 or M3 switch) is pressed, check that the driver side seat moves to the recorded position. OK The driver side seat moves to the memorized position. NG --> See step 12 OK: Go to next step
4. CHECK MEMORY AND REACTIVATION FUNCTION Turn the engine switch on (IG). Using the outer mirror switch assembly, turn the mirror surface to the fully left position. Press the M1 switch while the SET switch is being pressed. Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized. Using the outer mirror switch assembly, turn the mirror surface to the fully right position. Press the M1 switch. Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the recorded fully left position. Result Result Proceed to Memory and reactivation function on both mirrors is normal A Memory and reactivation function on RH side mirrors is not normal B Memory and reactivation function on LH side mirror is not normal C TEXT IN ILLUSTRATION *1 Turn to Left Fully C --> See step 9 B --> See step 7 A --> See step 13
5. CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH - OUTER MIRROR CONTROL ECU ASSEMBLY) Disconnect the J3 connector from the outer mirror control ECU assembly. Disconnect the J5 connector from the seat memory switch. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition J5-1 (MMRY) - J3-1 (MM) Always Below 1 ohms J5-2 (1) - J3-2 (M1) Always Below 1 ohms J5-3 (2) - J3-3 (M2) Always Below 1 ohms J5-4 (3) - J3-4 (M3) Always Below 1 ohms J5-5 (E) - J3-13 (MSWE) Always Below 1 ohms J5-1 (MMRY) - Body ground Always 10 kohms or higher J5-2 (1) - Body ground Always 10 kohms or higher J5-3 (2) - J3-3 (M2) Always 10 kohms or higher J5-4 (3) - J3-4 (M3) Always 10 kohms or higher J5-1 (MMRY) - J3-1 (MM) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Seat Memory Switch) *2 Front view of wire harness connector (to Outer Mirror Control ECU Assembly (Driver Side)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (SEAT MEMORY SWITCH - OUTER MIRROR CONTROL ECU ASSEMBLY) OK: Go to next step
6. INSPECT SEAT MEMORY SWITCH Remove the seat memory switch. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/seats/#seat-service-information) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition J5-2 (1) - J5-5 (E) M1 Switch off --> on 10 kohms or higher --> Below 1ohms J5-3 (2) - J5-5 (E) M2 Switch off --> on 10 kohms or higher --> Below 1ohms J5-4 (3) - J5-5 (E) M3 Switch off --> on 10 kohms or higher --> Below 1ohms J5-1 (MMRY) - J5-5 (E) SET Switch off --> on 10 kohms or higher --> Below 1ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Seat Memory Switch) NG --> See step 14 OK --> See step 15
7. REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH Replace the outer rear view mirror assembly RH. Refer to «REMOVAL». NEXT: Go to next step
8. CHECK MEMORY AND REACTIVATION FUNCTION Turn the engine switch on (IG). Using the outer mirror switch assembly, turn the mirror surface to the fully left position. Press the M1 switch while the SET switch is being pressed. Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized. Using the outer mirror switch assembly, turn the mirror surface to the fully right position. Press the M1 switch. Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the recorded fully left position. OK Memory and reactivation function is normal. TEXT IN ILLUSTRATION *1 Turn to Left Fully NG --> See step 16 OK --> END (OUTER REAR VIEW MIRROR ASSEMBLY RH WAS DEFECTIVE)
9. REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH Replace the outer rear view mirror assembly LH. Refer to «REMOVAL». NEXT: Go to next step
10. CHECK MEMORY AND REACTIVATION FUNCTION Turn the engine switch on (IG). Using the outer mirror switch assembly, turn the mirror surface to the fully left position. Press the M1 switch while the SET switch is being pressed. Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized. Using the outer mirror switch assembly, turn the mirror surface to the fully right position. Press the M1 switch. Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the recorded fully left position. OK Memory and reactivation function is normal. TEXT IN ILLUSTRATION *1 Turn to Left Fully NG --> See step 17 OK --> END (OUTER REAR VIEW MIRROR ASSEMBLY LH WAS DEFECTIVE)
11. GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART). Refer to «DIAGNOSTIC TROUBLE CODE CHART»
12. GO TO POWER SEAT CONTROL SYSTEM. Refer to «Power Seat Position is not Memorized»
13. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»
14. REPLACE SEAT MEMORY SWITCH. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/seats/#seat-service-information)
15. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER SIDE). Refer to «REMOVAL»
16. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER SIDE). Refer to «REMOVAL»
17. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER SIDE). Refer to «REMOVAL»

If any of the M1, M2 or M3 seat memory switches is pressed, the outer mirror control ECU assembly (driver side) detects the switch operation and sends the seat memory switch signal to the main body ECU (multiplex network body ECU) via CAN communication. On receiving the seat memory switch signal, the main body ECU (multiplex network body ECU) sends the memory request signal to each outer mirror control ECU assembly via CAN communication. When receiving this signal, each outer mirror control ECU assembly stores the mirror surface position based on information from the mirror position sensor, which is built into the outer rear view mirror assembly.

HINT

Each outer rear view mirror has a built-in mirror vertical position sensor and mirror horizontal position sensor.

Note. The mirror surface position will not be memorized if the engine switch is not on (IG). The mirror surface position will not be stored if the seat memory SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously. If the operation fails, the mirror surface position will not be memorized until the seat memory SET switch is turned off. The mirror surface position will not be memorized when the mirror is operated manually.

If any of the M1, M2 or M3 seat memory switches is pressed, the outer mirror control ECU assembly (driver side) detects the seat memory switch status and sends the switch signal to the main body ECU (multiplex network body ECU) via CAN communication. The main body ECU (multiplex network body ECU) sends back reproduction signals to each outer mirror control ECU assembly via CAN communication. When receiving the reproduction signals, each outer mirror control ECU assembly operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly, to adjust the mirror surface to the stored position.

If any of the M1, M2 or M3 seat memory switches is pressed, the outer mirror control ECU assembly (driver side) detects the seat memory switch status and sends the switch signal to the main body ECU (multiplex network body ECU) via CAN communication. The main body ECU (multiplex network body ECU) sends back reproduction signals to each outer mirror control ECU assembly via CAN communication. When receiving the reproduction signals, each outer mirror control ECU assembly operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly, to adjust the mirror surface to the stored position.

On receiving a reverse signal from the park/neutral position switch, the ECM sends the reverse signal to the main body ECU (multiplex network body ECU) via CAN communication. When receiving the reverse signal, the main body ECU (multiplex network body ECU) sends the reverse request signal to each outer mirror control ECU assembly. Each outer mirror control ECU assembly then performs control in response to the reverse signal.

HINT

The reverse shift-linked function will not activate when the mirror select switch is in the neutral position (off).

Scheme 20

On receiving a reverse signal from the park/neutral position switch, the ECM sends the reverse signal to the main body ECU (multiplex network body ECU) via CAN communication. When receiving the reverse signal, the main body ECU (multiplex network body ECU) sends the reverse request signal to each outer mirror control ECU assembly. Each outer mirror control ECU assembly then performs control in response to the reverse signal.

HINT

The reverse shift-linked function will not activate when the mirror select switch is in the neutral position (off).

The key ID can be registered to be linked with each of the M1, M2 and M3 seat memory switches. The key ID registration procedure should be performed while the electrical key transmitter is in the vehicle, the engine switch is on (IG), and the driver door is closed. When the registration is completed, the buzzer will sound as an answerback.

The key ID can be registered to be linked with each of the M1, M2 and M3 seat memory switches. The key ID registration procedure should be performed while the electrical key transmitter is in the vehicle, the engine switch is on (IG), and the driver door is closed. When the registration is completed, the buzzer will sound as an answerback.

When the vehicle doors are unlocked through wireless unlock or entry unlock operation, the certification ECU (smart key ECU assembly) sends the key ID signal and smart memory call request signal to the main body ECU (multiplex network body ECU). When the main body ECU (multiplex network body ECU) receives the signal and the driver door is opened, the ECU sends the memory call command signal for the received key ID to each outer mirror control ECU assembly. On receiving the memory call command signal, each outer mirror control ECU assembly controls to move the mirror surface to the stored position.

When the vehicle doors are unlocked through wireless unlock or entry unlock operation, the certification ECU (smart key ECU assembly) sends the key ID signal and smart memory call request signal to the main body ECU (multiplex network body ECU). When the main body ECU (multiplex network body ECU) receives the signal and the driver door is opened, the ECU sends the memory call command signal for the received key ID to each outer mirror control ECU assembly. On receiving the memory call command signal, each outer mirror control ECU assembly controls to move the mirror surface to the stored position.

See also:
• REMOVAL