Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2011LANDCRUISER V8-5.7L (3UR-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSLIN COMMUNICATION SYSTEM
2011 Toyota Landcruiser V8-5.7L (3UR-FE)
LIN Communication System
2011 Toyota Landcruiser V8-5.7L (3UR-FE)SECTION LIN Communication System
NETWORKING: LIN COMMUNICATION SYSTEM: LIN Communication Circuit
- LIN Communication Circuit
DESCRIPTION
The LIN communication of the components related to the rear heater occurs between the air conditioning amplifier (A/C ECU), rear air conditioning control panel and front air conditioning control panel*.
HINT
*: w/o Navigation System
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* When using the Techstream with the engine switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR CONDITIONING CONTROL PANEL)
(a) Disconnect the E36 amplifier connector.
(b) Disconnect the E55 and F10* panel connectors.
(c) Measure the resistance and voltage according to the value(s) in the tables below.
HINT
*: w/o Navigation System
Standard Resistance:
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK REAR AIR CONDITIONING CONTROL PANEL (BATTERY VOLTAGE AND BODY GROUND)
(a) Disconnect the E55 panel connector.
(b) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. REPLACE REAR AIR CONDITIONING CONTROL PANEL
(a) Temporarily replace the rear air conditioning control panel with a new or normally functioning one Removal.
(b) Check that the rear air conditioning function is normal.
OK:
Rear air conditioning function is normal.
Result
C -- REPLACE AIR CONDITIONING AMPLIFIER Removal
B -- CHECK FRONT AIR CONDITIONING CONTROL PANEL (BATTERY VOLTAGE AND BODY GROUND)
A -- END (REAR AIR CONDITIONING CONTROL PANEL IS DEFECTIVE)
4. CHECK FRONT AIR CONDITIONING CONTROL PANEL (BATTERY VOLTAGE AND BODY GROUND)
(a) Disconnect the F10 panel connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. REPLACE FRONT AIR CONDITIONING CONTROL PANEL
(a) Temporarily replace the front air conditioning control panel with a new or normally functioning one Removal.
(b) Check that the front air conditioning function is normal.
OK:
Front air conditioning function is normal.
NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal
OK -- END (FRONT AIR CONDITIONING CONTROL PANEL IS DEFECTIVE)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.