1990-1992 Cadillac Allante Air Bag & Restraint System Service Manual
This manual covers the Supplemental Inflatable Restraint (SIR) system for the 1990-1992 Cadillac Allante, detailing components like the DERM, arming sensor, and discriminating sensors. Includes diagnostic procedures.
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Models Covered & Key Technical Specifications
1990-1992 Cadillac Allante Air Bag & Restraint System Manual: Cadillac Allante manual, covers 1990-92 Technical-Briefing Allante Models (1990-1992) | Air Bag System
- System Overview: The SIR system is designed to protect the driver in a frontal collision with an air bag that deploys in less than 1/20 of a second.
- Diagnostic Energy Reserve Module (DERM): Maintains a 36-Volt Loop Reserve for 10-14 minutes to provide deployment energy if vehicle voltage is low or lost.
- Inflatable Restraint Indicator Light: Flashes 7-9 times upon ignition to warn of SIR electrical system faults and provides diagnostic information via fault codes.
- Arming Sensor: Closes switch contacts at low-level velocity changes, ensuring inflator module activation.
- Discriminating Sensors: Calibrated to close when deceleration velocity changes are severe enough to warrant deployment, wired in parallel on the deployment loop ground side.
- SIR Coil Assembly: Located in the steering column, it maintains continuous contact for the deployment loop through the inflator module.
Manual Description & Preview
1990-1992 Cadillac Allante Air Bag & Restraint System Manual: Cadillac Allante manual, covers 1990-92 Technical-Briefing
Allante Models (1990-1992) | Air Bag System
Metadata:
- Technical-Scope: Comprehensive coverage of the SIR system.
- Asset-ID: 1990-1992 Cadillac Allante Air Bag Manual.
- Technical-Scope: Detailed component and diagnostic information.
Technical Specifications Table
| Metric | Technical-Path | Architecture |
|---|---|---|
| Deployment Voltage | 36-Volt Loop Reserve | Energy supply for inflator module |
| Deployment Speed | < 1/20 second | Rapid air bag inflation |
| Indicator Light Flashes | 7-9 times | System fault warning |
| Arming Sensor Activation | Low-level velocity changes | Ensures inflator module activation |
| Discriminating Sensor Calibration | Severe deceleration | Triggers deployment |
| SIR Coil Assembly | Steering column mounted | Maintains deployment loop contact |
TOC Summary Block
The documentation provides guidance on:
- Supplemental Inflatable Restraint (SIR) System
- Diagnostic Energy Reserve Module (DERM)
- Inflatable Restraint Indicator Light
- Arming Sensor
- Discriminating Sensors
- SIR Coil Assembly
- Inflator Module
- Resistor Module
- Connector Identification
- Service Precautions
- Adjustments
Prose Paragraphs
System Operation
The Supplemental Inflatable Restraint (SIR) system is designed to protect the driver in a frontal collision. The air bag deploys upon frontal or near-frontal impact within 30 degrees of the vehicle's centerline. The system is not designed for rear, side impacts, or rollovers. Sudden deceleration from impacts around 14 MPH or higher triggers the inflator module via sensors.
Diagnostic Energy Reserve Module (DERM)
The Diagnostic Energy Reserve Module (DERM) is a critical component that maintains a 36-Volt Loop Reserve (36VLR) energy supply. This supply provides crucial deployment energy for approximately 10-14 minutes in the event of low or lost vehicle voltage during an accident. Furthermore, the DERM actively monitors all system components for faults, stores current and past SIR system fault code information, and alerts the driver to SIR system issues by controlling the INFLATABLE RESTRAINT indicator light. It also records SIR system status during a vehicle accident, making it an essential tool for post-incident analysis.
Inflatable Restraint Indicator Light
The Inflatable Restraint indicator light plays a vital role in driver notification and system verification. When the ignition is in the RUN or START position, battery voltage powers the light, and the Diagnostic Energy Reserve Module (DERM) illuminates it by providing a ground to a lamp driver. The light's operation is confirmed by flashing 7-9 times upon initial ignition, signaling proper bulb and DERM function. This light also serves as a diagnostic tool, flashing fault codes to indicate SIR electrical system faults that could impact system operation, especially in vehicles without on-board diagnostics.
Component Functionality
The arming sensor, a protective switch in the power feed side of the deployment loop, closes at lower velocity changes than discriminating sensors to ensure inflator module activation. Discriminating sensors, wired in parallel, are calibrated to close during severe deceleration velocity changes, initiating deployment. The SIR coil assembly in the steering column allows for continuous contact of the deployment loop through the inflator module.
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