Antilock Brake System Schematic Icons. GMC Truck GMC C-Series Medium Duty Truck B7 1999

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Antilock Brake System 🢒 Antilock Brake System Schematic Icons

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Notice: Electrostatic discharge (ESD) can damage many solid-state electrical components. ESD susceptible components may or may not be labeled with the ESD symbol. Handle all electrical components carefully. Use the following precautions in order to avoid ESD damage:

•	Touch a metal ground point in order to remove your body's static charge before servicing any electronic component; especially after sliding across the vehicle seat.

•	Do not touch exposed terminals. Terminals may connect to circuits susceptible the ESD damage.

•	Do not allow tools to contact exposed terminals when servicing connectors.

•	Do not remove components from their protective packaging until required to do so.

•	Avoid the following actions unless required by the diagnostic procedure:

-	Jumpering or grounding of the components or connectors.

-	Connecting test equipment probes to components or connectors. Connect the ground lead first when using test probes.

•	Ground the protective packaging of any component before opening. Do not rest solid-state components on metal workbenches, or on top of TVs, radios, or other electrical devices.

in Cautions and Notices.

Important: The wheel speed sensor (WSS) pigtail has female terminals. The ABS harness has female terminals. A Delphi© coupling with male terminals (P/N 12146445) is used to mate the two harnesses.

Be sure to check the connectors at both ends of this coupling during a visual diagnostic inspection of these circuits.

Important: Twisted-pair wires provide an effective "shield" that helps protect sensitive electronic components from electrical interference. Depending on application, twisted-pair wires are used on wiring harnesses connecting the following components:

•	electronic brake control module (EBCM)

•	wheel speed sensor (WSS)

In order to prevent electrical interference from degrading the performance of the connected components, you must maintain the proper specification when making any repairs to the twisted-pair wires shown :

•	The wires must be twisted a minimum of nine (9) turns per 30.5 cm (12 in) as measured anywhere along the length of the wires.

•	The outside diameter of the twisted wires must not exceed 6.0 mm 0.236 in).

Refer to Splicing Twisted or Shielded Cable in Wiring Systems.