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 |
