Grand AM L4-121 2.0L (1988)
Impact Sensor: Technical Service Bulletins
SIR Sensor - Revised Replacement Information
Bulletin Number: 93-9-8
Reference Number: 119105R
Publish Date: 5/93
Subject:
SIR SENSOR REPLACEMENT POLICY REVISED
Models Affected:
ALL 1988 - 1992 MODELS WITH SIR
THIS BULLETIN IS BEING REVISED TO ADD THE 1993 MODELS YEAR. THIS BULLETIN CANCELS AND REPLACES BULLETIN 92-9-9
ISSUED 1/92. PLEASE DISCARD BULLETIN 92-9-9.
General Motors has revised its policy on replacement of SIR sensors. Until now, all system sensors were replaced after an SIR deployment event. The
new replacement policy specifies mandatory replacement of the sensors in the area of accident damage only.
The "area of accident damage" is defined as that area of the vehicle which is crushed, bent, or damaged in other ways. An example might be a front-end
collision in which the forward portions of the vehicle have contacted another vehicle, tree, guardrail, etc. In this example, sensor(s) on the radiator tie bar
would require replacement, since that portion of the vehicle was damaged in the accident. Sensors in the passenger compartment, such as the Passenger
Compartment Discriminating Sensor, the Arming Sensor, or the Dual Sensor (if equipped), would not require mandatory replacement. Of course, if the
DERM sets a code and the diagnostic chart leads to a faulty sensor that was not in the area of accident damage, that sensor should also be replaced.
Sensors in the area of accident damage should be replaced even if those sensors do not appear to be damaged. Do not attempt to determine whether a
sensor is OK -- ALWAYS replace it if it is in the area of accident damage.
Also, if a sensor is in an area of accident damage, but the SIR system has NOT been deployed, replace the sensor. The sensor bracket may be slightly
bent, wiring may be damaged, etc., and the sensor might not work properly in another collision. Again, do not attempt to determine whether a sensor is
OK -- ALWAYS replace it if it is in the area of accident damage.
