Terminal Connections (Harness Plug)

Use the procedures in this section to check signals to and from the control unit. Check signals at the harness plug of the control unit. SeeFigure .

1. Check terminal No. 2 (Yellow), for ignition signal, with engine on. Terminal No. 4 (Yellow/White; Yellow/Blue on XT Coupe) is used in production to check control unit. A square sign wave, zero volt/11 volt, signal is used for checking. With ignition on, check terminal No. 5 (Brown; Brown/White on XT Coupe) for battery voltage.
2. With ignition on, check terminal No. 7 (Yellow/Red) for zero volt/5+ volt signal when speedometer cable is rotated. Check clutch switch wire, terminal No. 8, for ground connection. See CLUTCH SWITCH  in this article. Refer to chassis wiring diagram in WIRING DIAGRAM section for wire colors.
3. Control unit output signal to vent valve is through terminal No. 9 (White/Black). Terminal No. 10 (Black) is the permanent ground for the control unit.
4. Terminal No. 13 (Black/Yellow; Black/White on XT Coupe) is only present on automatic transaxle models. It is grounded when the shift selector is in "N" or "P" position.
5. Terminal No. 14 (Blue/White) supplies battery voltage to valve assembly when system is on. With ignition on, check for battery voltage at Terminal No. 15 (Brown); when brake pedal is depressed voltage should be zero.
6. Stop switch, terminal No. 17 (Green/Black) should have battery voltage only when brake pedal is depressed. If brake pedal is released, no voltage should be present.
7. Terminal No. 18 (White/Red) with ignition off and "SET" button depressed, battery voltage should be present. With switch released, no voltage should be present.
8. Terminal No. 19 (Yellow/Black) with ignition on and "RESUME" on, battery voltage should be present. With "RESUME" off, no voltage should be present. Control unit output signal to vacuum valve is through terminal No. 20 (Green).