Instrument Panel Cluster (IPC) Description and Operation: Speedometer

The IPC displays the vehicle speed as determined by the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit (4000 pulses/mile), class 2 message from the PCM in order to calculate the vehicle speed. If the IPC detects a malfunction in the vehicle speed signal circuit from the PCM, the uses the class 2 message from the EBCM, indicating the vehicle speed as a backup. If the speedometer reaches (108 mph). The speedometer displays either miles or kilometers as requested by the activation of the English/metric button on the driver information center (DIC). The associated indicator (km/h or mph) illuminates.