Pin Voltage Tests
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Using a DVOM connected to ground, backprobe to measure voltage or resistance at appropriate terminal of the body ECU No. 1 and body ECU No. 2 harness connectors unless otherwise specified. See BODY ECU NO. 1 PIN VOLTAGE CHART table and BODY ECU NO. 2 PIN VOLTAGE CHART table.
BODY ECU NO. 1 PIN VOLTAGE CHART
| Terminal No. (Symbol), Wire Color | Condition | Specification |
|---|---|---|
| 15 (ACC) - Body Ground (GND), Gray | Ignition Switch Position Is ACC | 10-14 Volts |
| 2 (TR) - Body Ground (GND), Blue | Luggage Compartment Door Opener Switch ON | 10-14 Volts (For 250 ms) |
| 1 (HORN) - Body Ground (GND), Green/Black | Anti-Theft System Is Set, Luggage Compartment Door Key Lock & Unlock Switch OFF, Luggage Compartment Door Open | Voltage Change 10-14 Volts - Less Than 1 Volt |
| 22 (IND) - Body Ground (GND), Violet | Security Indication Lights Up | 3-6 Volts |
| 22 (IND) - Body Ground (GND), Violet | Security Indicator Light Does Not Light Up | Less Than 1 Volt |
| 9 (HCTY) - Body Ground (GND), Violet/Green | Hood Is Open | Less Than 1 Volt |
| 9 (HCTY) - Body Ground (GND), Violet/Green | Hood Is Closed | 10-14 Volts |
| 10 (LGCY) - Body Ground (GND), Red/White | Luggage Door Is Open | Less Than 1 Volt |
| 10 (LGCY) - Body Ground (GND), Red/White | Luggage Door Is Closed | 10-14 Volts |
| 16 (TKUL) - Body Ground (GND), Light Green/Black | Luggage Door L & UK S/W Is Turned | Less Than 1 Volt |
| 16 (TKUL) - Body Ground (GND), Light Green/Black | Luggage Door L & UK S/W Is Not Turned | 10-14 Volts |
| 17 (TSW) - Body Ground (GND), Violet/Yellow | Luggage Opener S/W Is Operated | Less Than 1 Volt |
| 17 (TSW) - Body Ground (GND), Violet/Yellow | Luggage Opener S/W Is Not Operated | 10-14 Volts |
| 13 (BZR) - 12 (BZR2), Pink/Black - Pink/Blue | When Buzzer Is Sounded | 8-10 Volts |
| 13 (BZR) - 12 (BZR2), Pink/Black - Pink/Blue | When Buzzer Is Not Sounded | Less Than 1 Volt |
| 24 (SNOW) - Body Ground (GND), Green/Red | Snow Switch (ECT Pattern Select Switch) Is ON | Less Than 1 Volt |
| 24 (SNOW) - Body Ground (GND), Green/Red | Snow Switch (ECT Pattern Select Switch) Is OFF | 10-14 Volts |
| 23 (PWR) - Body Ground (GND), Green/White | PWR Switch (ECT Pattern Select Switch) Is ON | Less Than 1 Volt |
| 23 (PWR) - Body Ground (GND), Green/White | PWR Switch (ECT Pattern Select Switch) Is OFF | 10-14 Volts |
| 7 (RET) - Body Ground (GND), Pink/Green | Mirror Retract Switch ON | Less Than 1 Volt |
| 7 (RET) - Body Ground (GND), Pink/Green | PWR Switch (ECT Pattern Select Switch) Is OFF | 10-14 Volts |
| 19 (MPX1), White | Multiplex Communication System | ..... |
BODY ECU NO. 2 PIN VOLTAGE CHART
| Terminal No. (Symbol), Wire Color | Condition | Voltage |
|---|---|---|
| 9 (HRLY) - Body Ground (GND), Red/Green | Ignition Switch Position Is ON, Light Control Switch HEAD Position | Below 2 Volts |
| 9 (HRLY) - Body Ground (GND), Red/Green | Ignition Switch Position Is ON, Light Control Switch OFF Position | 10-14 Volts |
| 13 (ILE) - Body Ground (GND), Green | Each Door Is Opened | Below 2 Volts |
| 13 (ILE) - Body Ground (GND), Green | All Doors Are Closed | 10-14 Volts |
| 5 (KSW) - Body Ground (GND), Yellow | Key Inserted | Less Than 1 Volt |
| 5 (KSW) - Body Ground (GND), Yellow | Key Not Inserted | 10-14 Volts |
| 14 (STPI) - Body Ground (GND), Green/White | Brake Is ON | Less Than 1 Volt |
| 14 (STPI) - Body Ground (GND), Green/White | Brake Is OFF | 10-14 Volts |
| 4 (LF) - Body Ground (GND), Violet/Red | Stop Light, High Mount Stop Light & Taillight Is Normal | 10-14 Volts |
| 4 (LF) - Body Ground (GND), Violet/Red | Stop Light, High Mount Stop Light & Taillight Is Wire Break | Less Than 1 Volt |
| 2 (TAIL) - Body Ground (GND), Red/Yellow | Headlight Control Switch Position Is TAIL | Less Than 1 Volt |
| 2 (TAIL) - Body Ground (GND), Red/Yellow | Headlight Control Switch Position Is Except TAIL | 10-14 Volts |
| 15 (HEAD) - Body Ground (GND), Red/Black | Headlight Control Switch Position Is HEAD | Less Than 1 Volt |
| 15 (HEAD) - Body Ground (GND), Red/Black | Headlight Control Switch Position Is Except HEAD | 10-14 Volts |
| 3 (AUTO) - Body Ground (GND), Red | Headlight Control Switch Position Is AUTO | Less Than 1 Volt |
| 3 (AUTO) - Body Ground (GND), Red | Headlight Control Switch Position Is Except AUTO | 10-14 Volts |
| 10 (ALTL) - Body Ground (GND), Yellow/Red | Normal Condition | 2-3.5 Volts |
| 10 (ALTL) - Body Ground (GND), Yellow/Red | When wiring harness Is OPEN | 4-6 Volts |
| 19 (MPX2) | Multiplex Communication Circuit | ..... |