Body Control Module (BCM)

The BCM (1) is shown with the lower instrument panel LH removed. The BCM reads the air pressure signal received by the remote keyless entry receiver, and controls the low tire pressure warning lamp as shown below. It also has a self-diagnosis function to detect a system malfunction.

Fig 1: Identifying Body Control Module (BCM)

Courtesy of SUZUKI OF AMERICA CORP.

LOW TIRE PRESSURE WARNING LAMP CONDITION REFERENCE

Condition	Low tire pressure warning lamp
System normal	On for 1 second after ignition ON
Tire less than 193 kPa (2.0 kg/cm² , 28 psi) [Flat tire]	ON
Low tire pressure warning system malfunction	After key ON, flashes once per second for 1 minute, then stays ON