Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: No Answer-Back
DESCRIPTION
In some cases, wireless door lock control functions are normal but the hazard warning light and/or wireless door lock buzzer answer-back function does not operate. In such cases, hazard warning light and wireless door lock buzzer signal outputs from the main body ECU (multiplex network body ECU) may be malfunctioning.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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The wireless door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the wireless door lock control system after confirming that the communication system is functioning properly.
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Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (Hazard Answer Back, Wireless Buzzer Resp, Wireless Buzzer Vol) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Customize Setting / Wireless Door Lock.
(e) Select the setting by referring to the table below.
Wireless Door Lock| Tester Display | Description | Default | Setting | ECU |
|---|---|---|---|---|
| Hazard Answer Back | Function that flashes the hazard warning lights once when the doors are locked by wireless operation and twice when the doors are unlocked by wireless operation. | ON | 0:OFF,1:ON | Main body ECU (Multiplex network body ECU) |
| Wireless Buzzer Resp | Function that enables/disables the wireless power window buzzer response | ON | 0:OFF,1:ON | Main body ECU (Multiplex network body ECU) |
| Wireless Buzzer Vol | Function that adjusts the wireless door lock buzzer volume | Level 5 | 0000:Level7,0001:Level6,0010:Level5,0011:Level4,0100:Level3,0101:Level2,0110:Level1,0111:Level0 | Main body ECU (Multiplex network body ECU) |
| Result | Proceed to |
|---|---|
| Items are ON and except Level 0 | A |
| An item is OFF or Level 0 | B |
| B | .gif) | PERFORM CUSTOMIZE FUNCTION |
|
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| 2. | CHECK WIRELESS DOOR LOCK CONTROL FUNCTIONS |
(a) Check the wireless door lock control function using the electrical key transmitter sub-assembly.
| Result | Proceed to |
|---|---|
| Wireless door lock/unlock operates properly. | A |
| Wireless door lock/unlock does not operate properly. | B |
| B | | GO TO PROBLEM SYMPTOMS TABLE |
|
| 3. | READ VALUE USING TECHSTREAM (FR Door Lock Pos, FL Door Lock Pos, RR Door Lock Pos, RL Door Lock Pos) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| RR Door Courtesy SW | Rear door RH unlock detection switch signal | OFF or ON | OFF: Rear door RH locked ON: Rear door RH unlocked | - |
| RL Door Courtesy SW | Rear door LH unlock detection switch signal | OFF or ON | OFF: Rear door LH locked ON: Rear door LH unlocked | - |
| FR Door Lock Pos | Front door RH unlock detection switch signal | LOCK or UNLOCK | LOCK: Front door RH locked UNLOCK: Front door RH unlocked | - |
| FL Door Lock Pos | Front door LH unlock detection switch signal | LOCK or UNLOCK | LOCK: Front door LH locked UNLOCK: Front door LH unlocked | - |
| Tester Display |
|---|
| RR Door Courtesy SW |
| RL Door Courtesy SW |
| FR Door Lock Pos |
| FL Door Lock Pos |
OK:
The Techstream display changes correctly in response to the lock/unlock operation.
| NG | | GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit) |
|
| 4. | CHECK WIRELESS ANSWER-BACK OPERATION |
(a) Check the wireless answer-back operation using the electrical key transmitter sub-assembly.
| Result | Proceed to |
|---|---|
| Only wireless door lock buzzer answer-back does not occur. | A |
| Only hazard warning light answer-back does not occur. | B |
| A | | GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START |
|
| 5. | CHECK HAZARD WARNING LIGHTS OPERATION |
(a) Check that the hazard warning lights blink when the hazard warning signal switch is pressed.
OK:
Hazard warning lights blink.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (w/ Automatic Headlight Beam Level Control System) | B |
| NG (w/o Automatic Headlight Beam Level Control System) | C |
| A | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| B | | GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit) |
| C | | GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit) |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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