Pinpoint Test C: DTC P0568: SPEED CONTROL INPUT SIGNAL LOW/HIGH RESISTANCE

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Jaguar XKR, 2006 Jaguar XK8, 2005 Jaguar XKR, 2005 Jaguar XK8, and 2004 Jaguar XKR. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THE INTERNAL STEERING WHEEL CIRCUIT FOR HIGH RESISTANCE, RESUME SWITCH CIRCUIT
Disconnect the cassette reel electrical connector, SW02.

Connect an ohmmeter between SW02, pins 06 and 03.

Operate the RESUME switch.

Does the resistance switch between open circuit and 430 ohms as the switch is operated? (Non-adaptive).

Does the resistance switch between open circuit and 680 ohms as the switch is operated? (Adaptive).

YES: Go to step 2.

NO: INSTALL a new switchpack. Refer to Steering Column . CLEAR the DTC. TEST the system for normal operation.
CHECK THE INTERNAL STEERING WHEEL CIRCUIT FOR HIGH RESISTANCE, CANCEL SWITCH CIRCUIT
Operate the CANCEL switch.

Does the resistance switch between open circuit and 680 ohms as the switch is operated? (Non-adaptive).

Does the resistance switch between open circuit and closed circuit as the switch is operated? (Adaptive).

YES: Go to step 3.

NO: INSTALL a new switchpack. Refer to Steering Column . CLEAR the DTC. TEST the system for normal operation.
CHECK THE INTERNAL STEERING WHEEL CIRCUIT FOR HIGH RESISTANCE, SET/+ SWITCH CIRCUIT
Connect an ohmmeter between SW02, pins 06 and 04.

Operate the SET/+ switch.

Does the resistance switch between open circuit and 430 ohms as the switch is operated? (Adaptive and non-adaptive).

YES: Go to step 4.

NO: INSTALL a new switchpack. Refer to Steering Column . CLEAR the DTC. TEST the system for normal operation.
CHECK THE INTERNAL STEERING WHEEL CIRCUIT FOR HIGH RESISTANCE, - SWITCH CIRCUIT
Operate the - switch.

Does the resistance switch between open circuit and 680 ohms as the switch is operated? (Non-adaptive).

Does the resistance switch between open circuit and closed circuit as the switch is operated? (Adaptive).

YES: Go to step 5.

NO: INSTALL a new switchpack. Refer to Steering Column . CLEAR the DTC. TEST the system for normal operation.
CHECK THE STEERING WHEEL CASSETTE REEL FOR HIGH RESISTANCE
Disconnect the cassette reel electrical connector, SW01.

Connect a bridge lead between SW02, pins 03 and 06.

Measure the resistance between SW01, pins 03 and 06.

Connect a bridge lead between SW02, pins 03 and 04.

Measure the resistance between SW01, pins 03 and 04.

Is either resistance greater than 5 ohms?

YES: INSTALL a new cassette reel. Refer to Safety Belt System or Supplemental Restraint System . CLEAR the DTC. TEST the system for normal operation.

NO: Go to step 6.
CHECK THE STEERING WHEEL CASSETTE REEL TO ECM CIRCUITS FOR HIGH RESISTANCE
Disconnect the battery negative terminal.

Disconnect the ECM electrical connector, EM80.

Measure the resistance between SW01, pin 03 (YG) and EM80, pin 48 (YG).

Measure the resistance between SW01, pin 04 (YR) and EM80, pin 47 (YR).

Is either resistance greater than 5 ohms?

YES: REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. TEST the system for normal operation.

NO: Contact dealer technical support for advice on possible ECM failure.