Reatta V6-231 3.8L VIN C SFI (1990)
Malfunction Lamp / Indicator: All Technical Service Bulletins
Inflatable Restraint Light - Stays On
Bulletin 90-8-16
Date Nov. '90
Ref. No. 90-180-8
Corp. Ref. No. 019011
SUBJECT: INFLATABLE RESTRAINT TELLTALE STAYS ON (REPLACE DERM WITH EXCHANGE PART)
MODELS AFFECTED:
1990 RIVIERA AND REATTA MODELS
This bulletin is being revised due to duplicate Buick No. of 90-8-12. Please discard 90-8-12 dated September, 1990, Corporation Reference No. 019011,
and replace it with this bulletin.
Some 1990 Riviera and Reatta models equipped with Supplemental Inflatable Restraint (SIR) may exhibit the following condition: With the key on the
"Inflatable Restraint" telltale may turn on and stay on without flashing for a period of time which may range from a few seconds to a few minutes. The
lamp will then flash seven to nine times and go off indicating a return to normal operation.
Normal operation is for the light to flash seven to nine times after the key is turned on and then go off for the duration of the "key on" cycle.
FIGURE 1
The cause of the condition is SIR Diagnostic Energy Reserve Module (DERM) which is affected by voltage and temperature. DERM's from date code
9298 to 9333 may exhibit the condition. Refer to Figure 1 to interpret the date code. The condition may occur more frequently in cold ambient
temperatures. A BCM code B333, loss of SIR data, may also be set.
To repair the condition, replace the DERM with an available exchange part from an authorized AC-Delco Service Center.
IMPORTANT:
^
During the condition (INFLATABLE RESTRAINT telltale on) the DERM energy reserve is functional. The DERM can deploy the inflator in
case of an accident which damages the battery, but will not store SIR fault codes or crash data.
^
DERM's are an exchange part for 1990, and pre-exchange units are available. All exchange stock parts and all GMSPO non-warranty
replacement units have been purged of the date code range above. DERM's returned by dealerships to centers for repair will be modified to
prevent the condition and will be marked with repair revision "A" or later.
^
Before replacing the DERM, refer to "Service Precautions" in Section 9J of the 1990 Service Information Manuals.
^
After replacing the DERM, perform the SIR diagnostic system check in Section 9J of the 1990 Service Information Manuals to assure that
there are no other system problems which could cause an intermittent SIR light.
