Test readings, BCM: Scope

Fig 1: Checking Voltage

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The following contains values and instructions for measuring signals and levels on BCM.

Remember: 

• Note the test conditions and use common sense when assessing the test results.
• First check that the control module has a power supply and is grounded.
• Then check all sensor inputs and signals from other systems.
• Finally, check the control module outputs. Remember that the test reading does not indicate whether the actuator works.
• If any reading is not OK, consult the wiring diagram to trace which leads, connectors or components should be checked more thoroughly.
• The specified values refer to a calibrated Fluke 88/97.
• Test readings % (+) and ms (+) show the signal's pulse ratio and pulse length, respectively.

A test instrument that can measure pulse ratio and pulse width must be used. The sign indicates the positive trigger pulse, TRIG+.