Airbag - Testing Procedures & Precautions
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NO.: TSB-92-52B-002
DATE: May, 1992
MODEL: 1992 Diamante, 1991-92 3000GT
SUBJECT:
SRS TESTING PROCEDURES
AND PRECAUTIONS
PURPOSE
This Technical Service Bulletin explains testing procedures and precautions to follow during Supplemental Restraint System (SRS) diagnosis. It also provides supplemental information to Technical Service Bulletin number TSB-92-52B-001.
AFFECTED VEHICLES
1992 Diamante and 1991-92 3000GT
DESCRIPTION
To properly diagnose conditions affecting the SRS, the testing procedures and precautions outlined in this bulletin must be used. Failure to follow these procedures can lead to SRS malfunction and unnecessary SRS component replacement.
ERASING SRS FAULT CODES
When a customer's vehicle is returned with the SRS warning light illuminated, you must determine if the light is falsely illuminated, or if there is an actual SRS malfunction. To do this, follow these steps:
1. Perform a load test on the battery to determine its state of charge. If necessary, recharge the battery to a fully charged condition.
2. Conduct a complete charging system test using a Sun VAT-60 or equivalent. If any abnormal charging system conditions are found, correct them before proceeding.
3. Turn the vehicle's ignition key on and off repeatedly (at least ten times). If the SRS warning light does not go out, diagnose the system using the SRS troubleshooting information contained in the appropriate service manual. Continue troubleshooting until the SRS warning light turns off.
4. After correcting the SRS malfunction(s), use the Multi-Use Tester (MUT) to erase fault codes stored in the vehicle's memory.
NOTE:
To avoid storing false fault codes in the SRS ECU, do not disconnect any SRS components, fuses, or connectors unless the negative battery terminal has been disconnected for at least 30 seconds.
PRECAUTIONS WHEN DISCONNECTING THE SRS ECU CONNECTORS
1. As mentioned in the above NOTE, disconnect the negative battery terminal and wait at least 30 seconds before disconnecting the SRS ECU connectors.
2. Using a medium sized screwdriver, push in the lock spring (located under the greencolored lock lever). Pushing the lock spring will cause the lock lever to travel upward, unlocking the ECU connectors.
CAUTION:
To avoid damaging the lock lever, do not allow the screwdriver to enter the small gap between the lock lever and lock spring.
3. With the lock lever released, remove the connectors from the SRS ECU by pushing each connector's release tab down while gently pulling them from the ECU. DO NOT FORCE THE CONNECTORS. When the release tab is pushed down, each connector should be easy to remove.
4. For further information on the SRS ECU connectors, refer to the following service manuals:
- 1991 and 1992 3000GT, Volume 1, Pages 52B-9 and -10.
- 1992 Diamante, Volume 1, Pages 52B-9 and -10.
PRECAUTIONS WHEN WORKING WITH THE SRS CLOCK SPRING
1. When servicing the steering wheel (such as during steering wheel off-center corrections), the clock spring must be properly aligned in its NEUTRAL position.
2. Before reinstalling the steering wheel:
a. Make sure the front wheels are in the straight ahead position.
b. Align the clock spring's mating mark (located on the black case) with the NEUTRAL mark (located inside the gear).
WARNING:
If the clock spring's mating mark and neutral mark are not in alignment, the steering wheel may not rotate completely during a turn, and the flat wire cable in the clock spring may become severed. This will obstruct the normal operation of the SRS and possibly lead to serious injury to the vehicle's occupants.
3. For further information on the SRS clock spring, refer to the following service manuals:
- 1991 3000GT, Volume 1, Pages 52B-62 through -67.
- 1992 3000GT, Volume 1, Pages 52B-62 through -64.
- 1992 Diamante, Volume 1, Pages 52B-49 through -52.
WARRANTY INFORMATION
Replacement of any SRS component requires a PWA (Prior Work Authorization) from your District Service Manager. Also, please store all replaced SRS components carefully, since they will most likely be returned to MMSA for testing.