Scosche LPGM35 GM LAN Replacement Interface
For 2004-16 Select GM Vehicles with Chime and Steering Wheel Control Retention
Steering Wheel Controls
1. Determine if your vehicle has built-in stereo (audio) control buttons located on the steering wheel:
- a. If yes, proceed to step 2.
- b. If no, then disregard this steering wheel controls section.
2. Determine if your new stereo is compatible with steering wheel controls. Consult the installation manual provided with the stereo, or check the wiring connections behind the stereo:
- a. Some stereos have a 3.5 mm round (headphone type) input receptacle at the rear of the stereo labeled "SWC" or "SWC In".
- b. Some stereos have a Blue wire with a Yellow stripe (or other color) labeled: "SWC" or "SWC In".
3. Refer to the chart to prepare the Steering Wheel Control harness. Use the chart to determine which colored loop to cut and the corresponding connection for your particular stereo. If your brand is not listed in the chart, please call tech support for assistance: (800) 612-3695 Ext. 3.
4. Connect the 3.5mm Male jack to the back of the stereo's SWC input or connect the Brown (KEY1), Gray (KEY2) or Black (GND) to the stereo's SWC input wire.
5. Connect the Male 14-Pin connector to the interface module as shown in the diagram.
NOTE: Steering wheel control buttons and functions are provided as a guide. Your specific vehicle may differ.
Steering Wheel Legends
Steering Wheel Legend 1:
Δ: SEEK UP / PRESET UP+: VOLUME UPSOURCEMUTE-: VOLUME DOWN∇: SEEK DOWN / PRESET DOWN
Steering Wheel Legend 2:
+: VOLUME UP-: VOLUME DOWNSEEK UP/TRACK UPSEEK DOWN/TRACK DOWNMUTE
Steering Wheel Wiring Codes
1. Prepare LPGM35 steering wheel connector by using the chart below.
2. Connect the harness to the interface module.
3. For Alpine, Clarion, JVC, Panasonic and car stereos, connect the 3.5mm male steering plug into the steering wheel input jack at the back of the stereo.
4. For Kenwood and newer JVC stereos, connect the BROWN wire from the steering wheel harness to the REMOTE IN wire at the back of the stereo.
| Stereo Brand | Configuration* | Stereo Connection |
|---|---|---|
| Alpine | Cut Green loop | 3.5mm |
| Clarion | Cut Violet loop | 3.5mm |
| JVC | Cut Green & Violet loop | 3.5mm or Brown (Key 1) |
| Kenwood | Cut Orange & Green | Brown (Key 1) |
| Panasonic | Cut Orange | Brown (Key 1) |
| Sony | Cut White | 3.5mm |
| Pioneer | No cut required | 3.5mm |
| Other Brands | Call Tech Support | Brown, Gray, Black |
*NOTE: Cut wire ONLY. DO NOT remove!
Operation
When connected and installed per these instructions, the aftermarket car stereo should operate just like the factory system did. If using steering wheel controls and a compatible stereo, refer to the diagram at the top of this page for button functions. The chimes will be produced by the speaker inside the interface module located in the dash behind your stereo. The retained accessory power function of the stereo will continue to operate as normal. The interface module will send the proper DATA commands to your vehicle's electronics module to keep your vehicle's diagnostics system functioning normally, as with the factory stereo. Consult your stereo owner's guide for information specific to the operations of your new car stereo.
Factory Chimes Produced by the LPGM35 Replacement Interface:
- Seatbelt warning chime
- Park assist (if equipped)
- Key left in ignition chime
- Lights left on chime
- Low fuel
- Service reminders/warnings when displayed on instrument cluster
For complete warranty details, please visit us at www.scosche.com or call (800) 363-4490.
Vehicle Applications
The LPGM35 GM LAN stereo replacement interface will allow you to replace your GM factory stereo and retain all safety and warning chimes with your aftermarket car stereo. The interface will also retain steering wheel controls (if equipped) when using a compatible aftermarket stereo.
| Make/Model | Year | Harness | Make/Model | Year | Harness |
|---|---|---|---|---|---|
| BUICK Enclave | 2008-12 | A | GMC Acadia | 2007-12 | A |
| BUICK Lucerne | 2006-10 | A | GMC Savana | 2008-16 | A |
| CHEVROLET Avalanche | 2007-13 | A | GMC Sierra 1500-3500 (excluding Classic) | 2007-13 | A |
| CHEVROLET Cobalt | 2007-10 | B | GMC Yukon | 2007-14 | A |
| CHEVROLET Cobalt | 2005-06 | C | GMC Yukon XL | 2007-14 | A |
| CHEVROLET Equinox | 2007-09 | A | HUMMER H2 | 2008-09 | A |
| CHEVROLET Express Van | 2008-16 | A | PONTIAC G5 | 2007-09 | B |
| CHEVROLET HHR | 2006-11 | B | PONTIAC G6 | 2008-09 | B |
| CHEVROLET Impala/Impala SS | 2006-13 | A | PONTIAC G6 | 2005-07 | C |
| CHEVROLET Malibu | 2008-10 | B | PONTIAC Solstice | 2006-09 | B |
| CHEVROLET Malibu (excluding Classic) | 2004-12 | A | PONTIAC Torrent | 2007-09 | A |
| CHEVROLET Malibu Maxx | 2004-06 | B | SATURN Aura | 2007-09 | B |
| CHEVROLET Monte Carlo | 2006-07 | C | SATURN Outlook | 2008-09 | A |
| CHEVROLET Silverado 1500-3500 (excluding Classic) | 2007-13 | A | SATURN Sky | 2006-09 | B |
| CHEVROLET Suburban | 2007-14 | A | SUZUKI XL7 | 2007-10 | A |
| CHEVROLET Tahoe | 2007-14 | A | |||
| CHEVROLET Traverse | 2009-12 | A |
*For 2012-13, not compatible with Factory Navigation equipped vehicles.
**For 2012-14, not compatible with Factory Navigation equipped vehicles.
Preliminary Information
Application Notes
| Application Notes | Std. Radio | Std. Bose | Premium Bose | Retains OnStar |
|---|---|---|---|---|
| Not for use on "Premium Bose" or to retain OnStar systems. See application list on page 1 and note below. | Yes | Yes | No | No |
"Standard" BOSE and "Premium" BOSE systems:
There are two types of BOSE systems available in many GM models listed above. The LPGM35 replacement interface will only provide full features with "Standard" BOSE. The LPGM35 is not compatible with "Premium" BOSE systems. Here are some tips to determine if your vehicle is equipped with a "Premium" Bose system:
- Check the glove compartment for the Premium Bose Y91/Z75 BOSE radio code. This code may be found on a service parts sticker.
- Premium BOSE systems often include a CENTER CHANNEL Speaker located in the middle of the vehicle dashboard.
- Premium Bose radios also provide Digital Signal Processing (Surround Sound) audio adjustments.
Alternate products are available from Scosche to integrate or retain OnStar and Premium Bose systems. Call Scosche for additional information at (800) 621-3695 Ext. 3. In the instance where you are RE-WIRING the vehicle and bypassing the "Premium" Bose Amplifier, the LPGM35 can be used to retain FACTORY Warning chimes.
LPGM35 Overview
This section describes the components of the LPGM35 system.
- LPGM35 Interface Module: The main processing unit.
- Chime Speaker (Inside): Provides factory warning chimes.
- LPGM35 Steering Wheel Control Harness: Connects to the steering wheel controls.
- Interface Harness A, B, or C: One of these harnesses is included and must be selected based on your vehicle. See the list on page 1 for the correct harness.
Diagram Description: The overview shows the LPGM35 Interface Module, the Chime Speaker, the Steering Wheel Control Harness, and three Interface Harnesses (A, B, C) which connect to the module and the vehicle's factory wiring.
Why You Need This Part
Your factory stereo is an integral part of your vehicle's SAFETY and WARNING CHIME systems. If the stereo is removed without the proper installation accessory, various warning chimes and/or some functions of your vehicle may be LOST, including:
- Seatbelt warning chime
- Park assist (if equipped)
- Lights left on chime
- RAP (Retained Accessory Power)
- Key left in ignition chime
- Low fuel
- +12V Accessory Power at Radio's location
- Steering wheel audio controls (if equipped)
Your vehicle's ECM (Electronics Control Module) will also store an error code if operated without the factory radio installed, and you may experience difficulty in having the vehicle serviced at the dealership. The interface module/harness allows you to REPLACE the factory stereo and RETAIN all SAFETY and WARNING chimes. Additionally, the LPGM35 replacement interface will send the proper data commands to your vehicle's ECM (Electronics Control Module) to indicate a "Healthy" status for diagnostic purposes. The interface module/harness ALSO provides a RED +12V switched ACCESSORY power source for your aftermarket stereo.
Wiring Instructions
1. Disconnect the Negative battery cable from the battery to avoid any short circuits.
2. Remove and unplug the factory stereo. (If needed, call Scosche Tech Support (800) 621-3695 x3 for stereo removal steps specific to your vehicle.)
3. Match and connect the appropriate wires from the harness to the appropriate wires of the plug provided with your stereo. For example, connect the +12V yellow constant lead from your stereo to the yellow wire of the harness. The color codes are designed to match MOST brands of car stereos.
NOTE: If your vehicle is equipped with steering wheel controls and you are installing a compatible aftermarket stereo, see pages 10-11 for connection information.
4. Note that the RED +12V switched wire for your aftermarket stereo is coming from the relay, not the vehicle harness.
5. Tape all unused wires to prevent short circuiting.
6. Reconnect the Negative battery cable.
7. Connect the 16-Pin harness to the interface module.
8. Connect the harness A, B, or C to the factory harness.
9. As you install your new stereo, place the interface module in the rear of the dash cavity behind the stereo. (Optional: Cable ties or double-sided tape can be used to secure the module, but are not included.)
Wiring Notes
- There are additional yellow, black, and violet wires PRE-CONNECTED between the connector and the vehicle A, B, or C connector. These are Power and Data wires for the module itself. DO NOT MAKE ANY CONNECTIONS with these wires.
- If your stereo does not contain an "illumination" wire, then the orange wire will not be used. Tape or terminate all unused wires to prevent short circuits.
- "Illumination" outputs are rated at 2 amperes max. They are designed for aftermarket stereos which require an "illumination" connection. If you are using other high-demand lighted accessories (e.g., aftermarket gauges or trailer lights), do not use the illumination output from your stereo harness A, B & C.
- Auto illumination (Harnesses A & B only) is limited to GM LAN vehicles and if the vehicle is equipped with auto-sensing headlights. Please refer to your vehicle's owner's manual for details.
Wiring Color Codes & Diagram
Wiring Color Codes:
| Wire Color | Function | Wire Color | Function |
|---|---|---|---|
| White | Left Front Positive (LF+) | Orange | Illumination |
| White/Black | Left Front Negative (LF-) | Green | Left Rear Positive (LR+) |
| Violet/Black | Right Rear Negative (RR-) | Green/Black | Left Rear Negative (LR-) |
| Violet | Right Rear Positive (RR+) | Gray/Black | Right Front Negative (RF-) |
| Black | Chassis Ground (-12V) | Gray | Right Front Positive (RF+) |
| Yellow | +12 Volt Battery Constant | Red | +12 Volt Ignition Switched (Coming from LPGM35 module) |
| Blue/White | +12V Remote Output (Amp Remote, Radio ON Signal) |
Most color codes used on this car stereo connector conform to the standards set by the E.I.A. (Electronics Industry Association). They may differ from the wiring codes found on your car stereo. Always refer to your stereo owner's manual for wiring details about your particular car stereo.
Connection Diagram Description: The diagram illustrates the connection flow: Aftermarket Car Stereo connects to the LPGM35 Interface Module via its harness. The LPGM35 Interface Module then connects to the vehicle's factory wiring using one of the LPGM35 A/B/C Harnesses, which interfaces with the Factory 24-PIN Wiring Harness.
Important Safety Information
BEFORE BEGINNING: READ THESE INSTRUCTIONS!
CAUTION: Disconnect the negative battery terminal to avoid short circuits. Read ALL manufacturer's warnings regarding air bags and electrical systems in your vehicle. We recommend the use of a volt-ohm meter or computer-safe LED probe when checking wiring. A test light or grounded light probe, if used improperly, can cause damage to the vehicle's computer and/or diagnostic system.
[STOP] IMPORTANT!
DO NOT RETURN PRODUCT TO THE RETAILER
IF YOU NEED ASSISTANCE OR REPLACEMENT PARTS CALL US TOLL FREE: 1-800-363-4490 X1
HOURS: MON-FRI 8AM-5:30PM (PST) SATURDAY 8AM-2PM (PST)
©2018 SCOSCHE INDUSTRIES, INC. SI- LPGM35 (3000572) 6/18
