Lexus NX: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
- Use the following procedure to troubleshoot the air conditioning system.
- *: Use the Techstream.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
|
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| 2. | INSPECT AUXILIARY BATTERY VOLTAGE |
(a) Inspect the auxiliary battery voltage with the power switch off.
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.
(b) Check the "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2)".
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| Tester Display |
|---|
| Operation Limitation Control History Count (Level1) |
| Operation Limitation Control History Count (Level2) |
HINT:
If a value other than zero is displayed for "Operation Limitation Control History Count (Level1)" or "Operation Limitation Control History Count (Level2)", PTC heater, seat heater system (w/ Seat Heater System) and climate control seat system (w/ Climate Control Seat System) operation may have been limited in the past. If the operation is still limited, the message "High Power Consumption Partial Limit On AC/Heater Operation." will be displayed on the multi-information display in the combination meter assembly. In this case, inspect the charging system.
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(c) Clear the "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2)".
Body Electrical > Air Conditioner > Utility| Tester Display |
|---|
| A/C Operation Limitation History Count Clear |
|
| 3. | CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* |
(a) Use the Techstream to check if the LIN communication system is functioning normally.
| Result | Proceed to |
|---|---|
| LIN DTC is not output | A |
| LIN DTC is output | B |
| B | .gif) | GO TO LIN COMMUNICATION SYSTEM |
|
| 4. | CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* |
(a) Use the Techstream to check if the CAN communication system is functioning normally.
| Result | Proceed to |
|---|---|
| CAN DTC is not output | A |
| CAN DTC is output | B |
| B | | GO TO CAN COMMUNICATION SYSTEM |
|
| 5. | CHECK FOR DTC* |
(a) Check for DTCs and note any codes that are output.
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(b) Clear the DTCs.
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(c) Recheck for DTCs. Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the operation indicated by the DTC.
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| Result | Proceed to |
|---|---|
| DTC is not output | A |
| DTC is output | B |
| B | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 6. | PROBLEM SYMPTOMS TABLE |
(a) Refer to Problem Symptoms Table.
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| Result | Proceed to |
|---|---|
| Fault is not listed in Problem Symptoms Table | A |
| Fault is listed in Problem Symptoms Table | B |
| B | | ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE |
|
| 7. | OVERALL ANALYSIS AND TROUBLESHOOTING* |
(a) Data List / Active Test
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(b) Terminals of ECU
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(c) On-vehicle Inspection
(d) Inspection
|
| 8. | ADJUST, REPAIR OR REPLACE |
| NEXT | | END |
READ NEXT:
Customize Parameters
CUSTOMIZE PARAMETERS 1. CUSTOMIZE AIR CONDITIONING SYSTEM (a) Customizing with the Techstream HINT: The following items can be customized. NOTICE:
When the customer requests a change in a function,
Initialization
INITIALIZATION INITIALIZATION SERVO MOTOR (a) Turn the power switch off. (b) Connect the Techstream to the DLC3. (c) Turn the power switch on (IG). (d) Press the A/C OFF switch. (e) Turn the Techstrea
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE NOTICE:
If the auxiliary battery voltage is low, the PTC heater, seat heater system (w/ Seat Heater System) and climate control seat system (w/ Climate Control Seat System) m
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Switch Lights of Remote Touch Always Illuminate or cannot be Controlled Using Rheostat
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When the remote touch is in self check mode, the switch illumination on the remote touch may remain on.
If any illumination controlled by the rheostat switch has a
Terminals Of Ecu
TERMINALS OF ECU CHECK MULTIPLEX NETWORK DOOR ECU (a) Disconnect the Y26 and Y27 multiplex network door ECU connectors. (b) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Conditi
