DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK AIR CONDITIONING TYPE
CHECK HARNESS AND CONNECTOR (A/C ECU - REAR AIR CONDITIONING CONTROL PANEL AND FRONT AIR CONDITIONING CONTROL PANEL*)
CHECK AIR CONDITIONING CONTROL PANEL (BATTERY VOLTAGE AND BODY GROUND)
CHECK REAR AIR CONDITIONING CONTROL PANEL
CHECK FRONT AIR CONDITIONING CONTROL PANEL
CHECK FRONT AIR CONDITIONING CONTROL PANEL
CHECK HARNESS AND CONNECTOR (A/C ECU - FRONT AIR CONDITIONING CONTROL PANEL)
CHECK FRONT AIR CONDITIONING CONTROL ASSEMBLY (BATTERY VOLTAGE AND BODY GROUND)
CHECK FRONT AIR CONDITIONING CONTROL ASSEMBLY
LIN COMMUNICATION SYSTEM - Rear Heater Control Panel LIN Communication Malfunction
DESCRIPTION
The LIN communication of the components related to the rear air conditioning occurs between the air conditioning amplifier (A/C ECU), rear air conditioning control panel and front air conditioning control panel.
WIRING DIAGRAM
INSPECTION PROCEDURE
- When using the intelligent tester with the ignition switch off to troubleshoot:
- Connect the intelligent tester to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
| 1.CHECK AIR CONDITIONING TYPE |
Check air conditioning type.
Result| Result | Proceed to |
| for 4-ZONE Type | A |
| except 4-ZONE Type | B |
| 2.CHECK HARNESS AND CONNECTOR (A/C ECU - REAR AIR CONDITIONING CONTROL PANEL AND FRONT AIR CONDITIONING CONTROL PANEL*) |
Disconnect the E36 amplifier connector.
Disconnect the F10* and E55 panel connector.
Measure the resistance and voltage according to the value(s) in the tables below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E36-21 (RLIN) - E55-4 (RLIN) | Always | Below 1 Ω |
| E36-20 (LIN1) - F10-5 (LIN1)* | Always | Below 1 Ω |
| E36-21 (RLIN) - Body ground | Always | 10 kΩ or higher |
| E36-20 (LIN1) - Body ground* | Always | 10 kΩ or higher |
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| E36-21 (RLIN) - Body ground | Always | Below 1 V |
| E36-20 (LIN1) - Body ground* | Always | Below 1 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK AIR CONDITIONING CONTROL PANEL (BATTERY VOLTAGE AND BODY GROUND) |
Disconnect the E55 panel connector.
Measure the resistance and voltage according to the value(s) in the tables below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E55-1 (E) - Body ground | Always | Below 1 Ω |
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E55-6 (IG) - Body ground | Ignition switch ON | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK REAR AIR CONDITIONING CONTROL PANEL |
Temporarily replace the rear air conditioning control panel with a new or normally functioning one ().
Check that the rear air conditioning function is normal.
- OK:
- Rear air conditioning function is normal.
Result| Result | Proceed to |
| OK | A |
| NG (w/ Navigation System) | B |
| NG (w/o Navigation System) (for LHD) | C |
| NG (w/o Navigation System) (for RHD) | D |
| |
|
| | REPLACE AIR CONDITIONING AMPLIFIER ()
|
|
|
| | REPLACE AIR CONDITIONING AMPLIFIER ()
|
|
|
| A | |
| |
| END (REAR AIR CONDITIONING CONTROL PANEL IS DEFECTIVE) |
|
| 5.CHECK FRONT AIR CONDITIONING CONTROL PANEL |
Disconnect the F10 panel connector.
Measure the resistance and voltage according to the value(s) in the tables below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F10-1 (GND) - Body ground | Always | Below 1 Ω |
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| F10-7 (IG+) - Body ground | Ignition switch ON | 11 to 14 V |
| | REPLACE FRONT AIR CONDITIONING PANEL ()
|
|
|
| 6.CHECK FRONT AIR CONDITIONING CONTROL PANEL |
Temporarily replace the front air conditioning control panel with a new or normally functioning one ().
Check the that front air conditioning function is normal.
- OK:
- Front air conditioning function is normal.
Result| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | REPLACE AIR CONDITIONING AMPLIFIER ()
|
|
|
| | REPLACE FRONT AIR CONDITIONING CONTROL ASSEMBLY ()
|
|
|
| A | |
| |
| END (FRONT AIR CONDITIONING CONTROL PANEL IS DEFECTIVE) |
|
| 7.CHECK HARNESS AND CONNECTOR (A/C ECU - FRONT AIR CONDITIONING CONTROL PANEL) |
Disconnect the E81 amplifier connector.
Disconnect the F10 panel connector.
Measure the resistance and voltage according to the value(s) in the tables below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E81-37 (LIN1) - F10-5 (LIN1) | Always | Below 1 Ω |
| E81-37 (LIN1) - Body ground | Always | 10 kΩ or higher |
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| E81-37 (LIN1) - Body ground | Always | Below 1 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 8.CHECK FRONT AIR CONDITIONING CONTROL ASSEMBLY (BATTERY VOLTAGE AND BODY GROUND) |
Disconnect the F10 panel connector.
Measure the resistance and voltage according to the value(s) in the tables below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F10-1 (GND) - Body ground | Always | Below 1 Ω |
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| F10-7 (IG+) - Body ground | Ignition switch ON | 11 to 14 V |
| | REPLACE FRONT AIR CONDITIONING CONTROL ASSEMBLY ()
|
|
|
| 9.CHECK FRONT AIR CONDITIONING CONTROL ASSEMBLY |
Temporarily replace the front air conditioning control panel with a new or normally functioning one ().
Check the that front air conditioning function is normal.
- OK:
- Front air conditioning function is normal.
Result| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
|
|
|
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
|
|
|
| A | |
| |
| END (FRONT AIR CONDITIONING CONTROL PANEL IS DEFECTIVE) |
|
