GM: Electra/Park Avenue/Ninety-Eight 1990-1993




Some vehicles are equipped with a Supplemental Inflatable Restraint (sir) or air bag system. The air bag (sir) system must be disabled before performing service on or around sir components or wiring. Failure to follow safety and disabling procedures could result in possible air bag deployment, personal injury or unnecessary sir system repairs.
The use of rubber hoses or parts other than those specified for the abs system may lead to functional problems and/or impaired braking or abs function. Install all components included in repair kits for this system. Lubricate rubber parts with clean fresh brake fluid to ease assembly. Do not use lubricated shop air to clean or dry components; damage to rubber parts may result.
Certain components in the abs/tcs system are not intended to be serviced or disassembled. Only those components with removal and installation procedures should be serviced.
Always disconnect the ebcm and pmv connectors before any welding is done on the vehicle.
Never connect or disconnect the ebcm or pmv connectors with the ignition on .
Use only brake fluid from an unopened container. Use of suspect or contaminated brake fluid can reduce system performance and/or durability.
When any hydraulic component or line is removed or replaced, it may be necessary to bleed the entire system.
A clean repair area is essential. Perform repairs after components have been thoroughly cleaned.
The ebcm is a microprocessor similar to other computer units in the vehicle. Insure that the ignition switch is off before removing or installing controller harnesses. Avoid static electricity discharge at or near the controller.
Never disconnect any electrical connection with the ignition switch on unless instructed to do so in a test.
Always wear a grounded wrist strap when servicing any control module or component labeled with a Electrostatic Discharge (esd) symbol.
Avoid touching module connector pins.
Leave new components and modules in the shipping package until ready to install them.
To avoid static discharge, always touch a vehicle ground after sliding across a vehicle seat or walking across carpeted or vinyl floors.
Never allow welding cables to lie on, near or across any vehicle electrical wiring.
Do not allow extension cords for power tools or droplights to lie on, near or across any vehicle electrical wiring.


Diagnosis of the anti-lock and/or traction control system consists of 3 steps which must be performed in order.

  1. Visual inspection
  3. Functional check
  5. Additional testing as specified by the functional check.

Some diagnostic procedures require that the ignition be left on for an extended period of time while testing. Low battery voltage may result, causing incorrect readings or impaired system function. It is recommended that a battery charger be connected and a slow charge applied during testing.