Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
.png)
| *A | w/o Seat Heater | *B | w/ Seat Heater |
(a) Disconnect the G39 air conditioning amplifier assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G39-2 (IG+) - G39-4 (GND) | R - W-B | Power source (IG) | Power switch on (IG) | 11 to 14 V |
| G39-2 (IG+) - G39-4 (GND) | R - W-B | Power source (IG) | Power switch off | Below 1 V |
| G39-1 (B) - G39-4 (GND) | B - W-B | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| G39-4 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the G39 air conditioning amplifier assembly connector.
(d) Measure the voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G39-5 (RDFG) - G39-4 (GND) | R - W-B | Rear window defogger signal | Power switch on (IG), rear window defogger switch off | 11 to 14 V |
| G39-5 (RDFG) - G39-4 (GND) | R - W-B | Rear window defogger signal | Power switch on (IG), rear window defogger switch on | Below 1 V |
| G39-14 (LIN1) - G39-4 (GND) | BE - W-B | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK REAR WINDOW DEFOGGER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY)
.png)
(a) Disconnect the G23 air conditioning control assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G23-8 (IG+) - G23-4 (E) | R - W-B | Power source (IG) | Power switch on (IG) | 11 to 14 V |
| G23-8 (IG+) - G23-4 (E) | R - W-B | Power source (IG) | Power switch off | Below 1 V |
| G23-4 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the G23 air conditioning control assembly connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G23-3 (LIN1) - G23-4 (E) | LG - W-B | LIN communication line | Power switch on (IG) | Pulse generation |
READ NEXT:
Diagnosis System
DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage with the power switch off. Standard Voltage: 11 to 14 V If the
Data List / Active Test
DATA LIST / ACTIVE TEST ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive func
Rear Window Defogger System does not Operate
DESCRIPTION When the rear window defogger switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly via LIN communicati
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the lighting system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT:
In troubleshooting, confirm that the problem symptoms h
Precaution
PRECAUTION PRECAUTION (a) Before disassembling the transfer assembly, thoroughly clean it to remove any foreign matter. This will help prevent contamination inside the transfer during disassembly and reassembly. (b) When removing the transfer cover or any other light alloy parts, do not pry them off
