Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
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| *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)
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(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 |
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