Pin Voltage Tests
WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 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 at cruise control ECU wiring harness connector unless otherwise specified. See CONNECTOR IDENTIFICATION . See CRUISE CONTROL ECU (C18) PIN VOLTAGE CHART table.
CRUISE CONTROL ECU (C18) PIN VOLTAGE CHART
| Terminal No. (Symbol), Wiring Color | Condition | Standard Voltage |
|---|---|---|
| 3 (STP) - 16 (GND), Green/White - Brown | Depress Brake Pedal | 10-16 Volts |
| 3 (STP) - 16 (GND), Green/White - Brown | Release Brake Pedal | Below 1 Volt |
| 4 (D) - 16 (GND), Green/Black - Brown | Shift To Positions Except D | Below 1 Volt |
| 4 (D) - 16 (GND), Green/Black - Brown | Shift To D Position | 10-16 Volts |
| 5 (PI) - 16 (GND), White/Green - Brown | Ignition Switch ON, Cruise Control Main Switch ON | Below 1.2 Volts |
| 5 (PI) - 16 (GND), White/Green - Brown | Ignition Switch ON, Cruise Control Main Switch OFF | 10-16 Volts |
| 10 (TC) - 16 (GND), Pink/Black - Brown | Ignition Switch ON | 10-16 Volts |
| 10 (TC) - 16 (GND), Pink/Black - Brown | Ignition Switch ON, Connect Terminals Tc & E1 Of Diagnostic Check Connector | Below 1 Volt |
| 6 (ECT) - 16 (GND), Red/Yellow - Brown | During Driving Gear Position 3rd | 10-16 Volts |
| 6 (ECT) - 16 (GND), Red/Yellow - Brown | During Driving Gear Position O/D | Below 1 Volt |
| 7 (MC) - 16 (GND), Blue/Red - Brown | During Cruise Control Driving COAST Switch Held ON | 9-15 Volts |
| 7 (MC) - 16 (GND), Blue/Red - Brown | During Cruise Control Driving ACC Switch Held ON | Below 1 Volt |
| 8 (L) - 16 (GND), Blue/Yellow - Brown | During Cruise Control Driving | 9-15 Volts |
| 8 (L) - 16 (GND), Blue/Yellow - Brown | Except During Cruise Control Driving | Below 1 Volt |
| 2 (B) - 16 (GND), Black/Red - Brown | Ignition Switch ON | 10-16 Volts |
| 11 (CCS) - 16 (GND), Blue - Brown | Ignition Switch ON | 10-16 Volts |
| 11 (CCS) - 16 (GND), Blue - Brown | Ignition Switch ON, CANCEL Switch Held ON | 6-11 Volts |
| 11 (CCS) - 16 (GND), Blue - Brown | Ignition Switch ON, SET/COAST Switch Held ON | 4.0-7.9 Volts |
| 11 (CCS) - 16 (GND), Blue - Brown | Ignition Switch Held ON, RES/ACC Switch Held ON | 2.0-4.6 Volts |
| 11 (CCS) - 16 (GND), Blue - Brown | Ignition Switch ON, MAIN Switch Held ON | Below 0.5 Volt |
| 12 (SPD) - 16 (GND), Violet/White - Brown | Engine Start, Car Stoppage | Below 1.5 Volt Or 4.7-16.0 Volts |
| 12 (SPD) - 16 (GND), Violet/White - Brown | During Driving (Pulse Generated) | 3-7 Volts |
| 13 (IDL) - 16 (GND), Black/Yellow - Brown | Ignition Switch ON, Throttle Valve Fully Opened | 10-16 Volts |
| 13 (IDL) - 16 (GND), Black/Yellow - Brown | Ignition Switch ON, Throttle Valve Fully Closed | Below 1.5 Volt |
| 14 (OD) - 16 (GND), Yellow/Green - Brown | During Cruise Control Driving, OD Switch ON | Pulse Generation |
| 14 (OD) - 16 (GND), Yellow/Green - Brown | During Cruise Control Driving, OD Switch OFF (3rd Driving) | Below 1 Volt |
| 15 (MO) - 16 (GND), Blue/Black - Brown | During Cruise Control Driving ACC Switch Hold ON | 9-15 Volts |
| 15 (MO) - 16 (GND), Blue/Black - Brown | During Cruise Control Driving, COAST Switch Hold ON | Below 1 Volt |
| 16 (GND) - Body Ground, Brown | Constant | Below 1 Volt |