1. Introduction
This manual provides essential instructions for the proper installation and use of the Metra Electronics GMLAN29-100 GMLAN 29 Harness. This product is designed to facilitate the integration of an aftermarket radio with a GMOS-100I interface in select General Motors vehicles equipped with a GMLAN 29-bit data bus system. Adherence to these instructions is crucial for optimal performance and to prevent damage to your vehicle's electrical system.
2. Product Features
- Direct Compatibility: Specifically designed for use with the Metra GMOS-100I interface.
- GMLAN 29-bit Data Bus Integration: Enables communication with the vehicle's data bus system.
- Pre-wired Connections: Simplifies installation by providing pre-terminated connectors for vehicle and interface.
- Durable Construction: Manufactured with quality materials for reliable performance.
3. Compatibility
The GMLAN29-100 harness is intended for use with the Metra GMOS-100I OnStar Interface. It is compatible with specific General Motors vehicles that utilize a GMLAN 29-bit data bus system. Please refer to the Metra website or product packaging for a detailed list of compatible vehicle makes, models, and years.
4. Installation and Setup
Professional installation is highly recommended. Incorrect installation can lead to damage to the vehicle's electrical system or the product itself. Always disconnect the vehicle's negative battery terminal before beginning any electrical work.
4.1 Required Tools and Materials
- Wire strippers/crimpers
- Electrical tape or heat shrink tubing
- Multimeter (for testing connections)
- Panel removal tools
- Vehicle-specific radio removal tools
4.2 Installation Steps
- Disconnect Battery: Ensure the vehicle's negative battery terminal is disconnected to prevent electrical shorts.
- Remove Factory Radio: Carefully remove the factory radio and associated trim panels according to your vehicle's service manual.
- Connect to GMOS-100I: Connect the appropriate connector from the GMLAN29-100 harness to the designated port on your Metra GMOS-100I interface. Refer to the GMOS-100I manual for specific port identification.
- Connect to Vehicle Wiring: Plug the vehicle-specific connector of the GMLAN29-100 harness into the factory wiring harness located behind the radio opening. Ensure a secure and proper fit.
- Wire Aftermarket Radio: Connect the remaining wires from the GMOS-100I interface (which is now connected to the GMLAN29-100 harness) to your aftermarket radio's wiring harness. Match wire functions (e.g., constant power, accessory power, ground, speaker wires) carefully.
- Secure Connections: Use electrical tape or heat shrink tubing to insulate all bare wire connections. Ensure all connections are secure and free from potential shorts.
- Test System: Before reassembling the dashboard, reconnect the vehicle's negative battery terminal. Turn on the ignition and test the functionality of the aftermarket radio, steering wheel controls (if applicable and supported by GMOS-100I), and other integrated features.
- Reassemble Dashboard: Once all functions are verified, carefully reassemble the dashboard and trim panels.
Image 1: The Metra GMLAN29-100 harness showing two black multi-pin connectors and various colored wires. One connector typically connects to the vehicle's factory wiring, and the other to the GMOS-100I interface.
5. System Integration and Operation
Once properly installed, the GMLAN29-100 harness, in conjunction with the GMOS-100I interface, enables the aftermarket radio to function correctly within the vehicle's electrical system. This includes providing power, ground, and data signals necessary for the radio's operation and for retaining factory features such as OnStar, warning chimes, and steering wheel controls (if supported by the GMOS-100I and aftermarket radio).
- Power On: The aftermarket radio should power on with the vehicle's ignition.
- Audio Output: Verify that audio is produced from all speakers.
- Factory Features: Test the functionality of retained factory features like OnStar, warning chimes, and steering wheel controls. Refer to the GMOS-100I manual for specific setup and troubleshooting of these features.
6. Maintenance
The GMLAN29-100 harness requires minimal maintenance. Periodically, if accessible, inspect the connections for any signs of corrosion, looseness, or damage. Ensure that all wiring is securely routed and not pinched or exposed to excessive heat or moisture. Do not attempt to modify the harness, as this may void any warranty and could cause electrical issues.
7. Troubleshooting
- No Power to Aftermarket Radio:
- Check vehicle's fuse box for blown fuses.
- Verify all connections between the GMLAN29-100 harness, GMOS-100I, and aftermarket radio are secure.
- Ensure the vehicle's battery is properly connected and charged.
- No Sound:
- Confirm speaker wires are correctly connected from the GMOS-100I to the aftermarket radio.
- Check aftermarket radio's settings (e.g., mute, volume).
- Ensure the GMOS-100I is receiving power and functioning correctly.
- Factory Features Not Working (OnStar, Chimes, SWC):
- Refer to the Metra GMOS-100I manual for specific programming and troubleshooting steps for these features.
- Ensure the GMLAN29-100 harness is fully seated in both the vehicle and the GMOS-100I.
- Intermittent Operation:
- Inspect all connections for looseness or poor contact.
- Check for any pinched or damaged wires.
8. Specifications
- Model Number: DAS-GMLAN29100
- Brand: Metra
- Manufacturer: Metra Electronics
- Connector Type: GMLAN 29-bit data bus compatible
- Compatibility: Designed for Metra GMOS-100I interface
- UPC: 086429212811
- First Available Date: November 3, 2010
9. Warranty and Support
Specific warranty information for the Metra GMLAN29-100 harness is not provided in this document. For details regarding warranty coverage, duration, and claims, please refer to the documentation included with your purchase or contact Metra Electronics directly through their official website or customer service channels. For technical support, it is recommended to consult a certified automotive electronics installer or contact Metra customer support.
