Description

Peterbilt 579 2014 Service Manual – Mirror System OEM Procedures

If you are fighting a mirror vibration, a heater that won’t clear ice, or an actuator that stopped responding on a Peterbilt 579 2014 Service Manual customer’s truck, the aftermarket PDFs won’t cut it. I have seen too many techs waste billable hours on generic instructions that skip the Lang-Mekra connector pin layout or the correct glass removal sequence. This is the original 29-page factory service manual from Lang-Mekra North America, revised January 2014. It covers only the mirror system – and it does it the way the engineer intended.

What Does This Manual Cover?

This manual stays inside the mirror assembly – housing, glass, actuator, bezel, gasket, and the full electrical system behind it. You get the mirror system overview on page 4, then each component disassembled step by step. Section 2 walks through carrier glass assembly for both convex and main mirrors. Section 4 covers actuator removal without breaking the plastic tabs. Section 7 dives into control cable and OAT sensor replacement. If you have ever snapped a wire terminal trying to force a connector apart, the wire terminal removal procedure on page 19 will save you a replacement harness.

Get the Glass Replacement Sequence Right – Page 5

Breaking the convex mirror glass during replacement costs more than the manual. Page 5 gives the exact prying points and adhesive removal method for the convex glass. Page 6 covers the main mirror glass – which uses a different retention system. I have seen aftermarket instructions tell you to “pry evenly,” which usually cracks the glass. The factory procedure tells you where to insert the tool and in what direction to apply force. That page alone pays for the manual.

7 Sections on Electrical Component Replacement

Section 7 is the meat of the manual – eight subsections dedicated to wiring. You get control cable routing, OAT sensor replacement with the exact removal angle, and three separate wire routing diagrams for OAT, heaters, and actuator wires. Page 18 shows the wire pin layout for the electrical connector. Page 19 explains how to remove wire terminals without damaging the locking tangs. If you have a mirror that heats on one side only, this is where you find the answer, not in a generic wiring schematic.

Heaters Troubleshooting: Voltage and Foil Checking

Section 8 splits heater diagnostics into four parts – analysis, voltage at heater terminals, heater foil continuity, and truck connector checking. The analysis step on page 21 tells you what symptoms point to a broken foil vs. a bad wire. The voltage check at the heater terminals requires a specific multimeter setting – the manual calls it out. I have chased heater grounds for half a shift only to find a partially torn foil that the manual’s continuity test would have caught in five minutes.

Source Authenticity: Why OEM Beats Aftermarket

I do not trust aftermarket documentation on principle. Lang-Mekra is the OEM supplier for Peterbilt mirror systems. This manual carries a 2014 copyright and revision date – no reprints, no third-party interpretations. The wiring colors, connector part numbers, and fastener sizes match exactly what you find on the truck. Aftermarket manuals often swap metric for SAE or skip the wire routing section entirely. This one does not. For the Manual Transmission side of the truck, you need a separate powertrain manual. For the mirrors, this is the only source I would use.

Who Needs This Manual?

If you are a home garage enthusiast swapping out a broken mirror on your 579, or a shop technician diagnosing an intermittent heater fault, this manual keeps you out of trouble. It assumes you have a trim tool set, a multimeter, and basic mechanical sense – but it does not assume you have memorized the Lang-Mekra connector layout. The Manual Transmission background might help with other systems, but here you need the mirror-specific harness routing. Pair this manual with the Peterbilt 579 Operators Manual – Factory OEM Specs”> for operating instructions, or get the Peterbilt 270 Service Manual 1999″> if you work on older models. The Peterbilt Medium Duty 2009 User Manual – Factory Driver’s Guide”> covers driver controls but not repair procedures.

FAQ – Common Questions About This Manual

Is this manual for the entire Peterbilt 579 truck or just the mirrors?

Mirrors only.

Does it include torque specifications for mirror bolts?

No. This manual focuses on removal, installation, and electrical diagnostics. Torque values are not listed.

Is the wiring diagram included for the mirror heaters and actuator?

Yes. Section 7 covers the full wire routing for OAT, heaters, and actuator wires, including pin layout on page 18. You get the factory connector installation procedure and how to remove wire terminals. The troubleshooting section on page 21 walks you through measuring voltage at heater terminals, checking heater foil continuity, and verifying the truck connector. If you have ever dealt with a mirror that will not heat or adjust, this saves you from replacing parts blindly.

Can I use this manual on a Peterbilt 579 built after 2014?

This is for the 2014 model year. Later revisions may exist. Check the revision date on page 2.

Enough time wasted on mirror repairs that should take an hour. Access the Factory Manual and get the OEM data that matches your truck’s VIN.