WenmarOpen by Wenmar Pro

Service bulletins for the 2012 Toyota 4Runner

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

356 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
T-TT-0307-142017-08-01. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). Tech Tip: Customer complains of carious Bluetooth connectivity concerns after upgrading to iOS 8.0 and later. Conditions typically experienced include inability to pair the iPhone to the system, poor sound quality during phone calls placed through the audio/navigation system, and the inability to place a hands free phone call using the audio/navigation system.
T-SB-0047-162017-04-05. Service bulletin. ELECTRICAL SYSTEM; HYBRID PROPULSION SYSTEM: INVERTER. TSB: THE BREATHER PLUG SHOULD BE REPLACED DURING ANY DIFFERENTIAL/TRANSFER CASE REPAIRS TO PREVENT POSSIBLE REPEAT FAILURES. THE SUBSEQUENT USE OF THE ORIGINAL BREATHER PLUG AFTER A REPAIR HAS BEEN FOUND TO CONTRIBUTE TO THE FAILURE OF THE DIFFERENTIAL/TRANSFER CASE COMPONENTS. REPLACE THE BREATHER PLUG WHEN REPLACING DIFFERENTIAL/TRANSFER CASE COMPONENTS.
T-TT-0362-152017-03-28. Service bulletin. ELECTRICAL SYSTEM; ENGINE. TT: THE VEHICLE MAY BE DIFFICULT TO START OR HAVE AN ABNORMALLY LOW OR ROUGH IDLE AFTER THE BATTERY HAS BEEN DISCONNECTED OR POWER TO THE ENGINE ECM HAS BEEN INTERRUPTED.
T-SB-0012-13 REV2017-03-21. Service bulletin. ENGINE; ELECTRICAL SYSTEM. "TSB: FLASH REPROGRAMMING ALLOWS THE ECU SOFTWARE TO BE UPDATED WITHOUT REPLACING THE ECU. FLASH CALIBRATION UPDATES FOR SPECIFIC VEHICLE MODELS/ECUS ARE RELEASED AS FIELD-FIX PROCEDURES DESCRIBED IN INDIVIDUAL SERVICE BULLETINS. THIS BULLETIN DETAILS THE TECHSTREAM ECU FLASH REPROGRAMMING PROCESS AND OUTLINES USE OF THE TECHNICAL INFORMATION SYSTEM (TIS) AND THE CALIBRATION UPDATE WIZARD (CUW). FLASH CALIBRATION UPDATES CAN ONLY BE APPLIED TO THE VEHICLE/ECU COMBINATION FOR WHICH THEY ARE INTENDED. ECUS HAVE INTERNAL SECURITY THAT WILL NOT ALLOW THEM TO BE PROGRAMMED WITH ANOTHER ECU’S INFORMATION."
T-TT-0385-162017-03-01. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. "TECH TIP: THIS TECH TIP IS BEING PROVIDED TO BRING ATTENTION TO THE NEW LOCATION OF THE ENTUNE/NAV/MAP UPDATE AND UPGRADE USB DIRECTORY. CLICK ON THE TIS TAB, DIAGNOSTICS TAB, TELEMATICS TAB, AND THE DOCUMENT IS NOW LOCATED UNDER THE REFERENCE DOCUMENTS SECTIONS. THIS CHANGE HAS OCCURRED TO HELP SPEED UP THE UPDATING PROCESS OF THIS DOCUMENT. "
T-TT-0392-16 REV2017-02-23. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. TT: SOME CUSTOMERS MAY EXPERIENCE BLUETOOTH CONNECTION ISSUES AFTER UPDATING THE ANDROID OPERATING SYSTEM TO 5.X.X (LOLLIPOP) OR LATER.
T-SB-0061-15 REV2016-11-16. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); ELECTRICAL SYSTEM. TSB: REVISION NOTICE: INTRODUCTION HAS BEEN UPDATED. ANY PREVIOUS PRINTED VERSIONS OF THIS BULLETIN SHOULD BE DISCARDED. SOME 2012 MODEL YEAR VEHICLES EQUIPPED WITH A DISPLAY AUDIO NAVIGATION SYSTEM AND ENTUNE™ (VERSION LESS THAN 2.1.0) MAY EXHIBIT 1 OR MORE OF THE FOLLOWING CONDITIONS; SOME 2012 – 2013 MODEL YEAR VEHICLES EQUIPPED WITH A DISPLAY AUDIO NAVIGATION SYSTEM (NON-HDD) AND ENTUNE™ (VERSION LESS THAN 2.2.0) MAY EXHIBIT 1 OR MORE OF THE FOLLOWING CONDITIONS; SOME 2012 – 2014 MODEL YEAR VEHICLES EQUIPPED WITH A DISPLAY AUDIO NAVIGATION SYSTEM (NON-HDD) AND ENTUNE™ (VERSION LESS THAN 3.2.0) MAY EXHIBIT 1 OR MORE OF THE FOLLOWING CONDITIONS; SOME 2012 – 2015 MODEL YEAR VEHICLES EQUIPPED WITH A DISPLAY AUDIO NAVIGATION SYSTEM (NON-HDD) AND ENTUNE™ (VERSION LESS THAN 4.1.0) MAY EXHIBIT 1 OR MORE OF THE FOLLOWING CONDITIONS; SOME 2012 – 2015 MODEL YEAR VEHICLES EQUIPPED WITH A DISPLAY AUDIO NAVIGATION SYSTEM (NON-HDD) AND ENTUNE™ (VERSION LESS THAN 5.1.0) MAY EXHIBIT 1 OR MORE OF THE FOLLOWING CONDITIONS.
T-SB-0033-132016-04-12. Service bulletin. ELECTRICAL SYSTEM:IGNITION. SUMMARY TO BE PROVIDED ON A FUTURE DATE.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.