Begin troubleshooting with the main fuse block under the hood–terminal 30 supplies constant 12V power, while terminal 15 activates only when ignition is turned to RUN. Verify continuity between pin A7 (brown/white) on the BCM and pin 12 (violet/black) on the TIPM using a multimeter set to 200 ohms; resistance above 0.3 ohms indicates corrosion at the chassis ground (G300). Replace the 20A J-case fuse for the powertrain control module if voltage drops below 11.8V at connector C2 (gray) during cranking.
For fuel pump diagnostics, probe cavity #8 (pink/orange) on the under-dash relay center–expect a 5V PWM signal at 200Hz. If absent, inspect the rear harness between the body control module and the sender unit for chafing near the spare tire well, where circuit Z1-14 (yellow/light blue) frequently shorts to ground. The anti-theft module requires pin #3 (red/black) to be pulled low to enable start–test with a jumper wire before condemning the PCM.
Headlight circuits use CAN bus communication between the front control module and the multifunction switch. Measure voltage at pin #2 (tan/light green) on connector J13–normal range is 3.2-3.8V with headlights ON. If readings fluctuate, isolate the CAN-L line (purple/green) at the DLC connector and check for shorts to battery voltage, which corrupts the signal. The park brake relay (R04) fails if pin #5 (dark blue/white) exceeds 12.5V when the brake is released; replace the relay if continuity exists at rest.
Update the Totally Integrated Power Module firmware if erratic accessory operation occurs–download version v7.3.6 from the manufacturer’s service site and flash via the OBD-II port using a J2534 pass-thru tool. For rear defroster grids, apply 12V directly to connector T40 (red/black, pin #1) while monitoring current draw; 15A or higher indicates an open element requiring repair with conductive epoxy rated to 60Ω/sq. in.
Electrical Schematic Guide for the 2016 Model Sedan
Locate the fuse box under the left side dashboard–remove the lower trim panel by prying the three plastic clips near the steering column base. Pinout labels correspond directly to terminal numbers on the BCM harness connector C1 (24-way, black) and C2 (48-way, gray). Cross-reference color codes: dark green/violet stripe (D5G/V) feeds the rear defogger relay coil; orange/black stripe (O/BK) is ignition-switched power for the PDC module.
For door lock actuator circuits, trace the tan/light blue stripe (T/LB) wire from the front driver’s side door jamb switch to splice S138. This splice branches to each actuator motor–resistance should measure 4–7 ohms across terminals. If voltage drops below 11.8V at splice S138 during activation, inspect the 30A fuse F53 in the under-hood distribution center for corrosion, then test relay R3 (horn/door lock) by swapping with R10 (AC clutch).
Critical Connector Pinouts
- TCM connector C3: Pin 8 (gray/red stripe) carries transmission fluid temperature data, critical for shift logic–verify signal oscillates between 0.5V (cold) and 4.5V (hot) at 200Hz.
- PCM connector C4: Pin 37 (yellow/black stripe) delivers crankshaft position pulses–scope should show square waves peaking at 9V with 50% duty cycle at idle.
- Instrument cluster connector C1: Pin 12 (blue/orange stripe) supplies fuel level sensor voltage–reference 5V at the sender; voltage-divided signal must align with gauge sweep from 0.5V (empty) to 4.5V (full).
Troubleshooting Shorts
- Disconnect battery negative terminal. Remove the right rear quarter trim panel to access the rear SAM module–check pins B3 (white/red stripe) and B8 (gray/yellow stripe) for chafing against the wheel well brace.
- Inspect the MOPAR ground G101 behind the left headlight assembly for loose studs; torque to 12 Nm. Corrosion here mimics body control module failure–intermittent unlock errors typically resolve after cleaning.
- If Bluetooth fails, probe the Uconnect antenna amplifier connector A4 (light blue/violet stripe) at the back of the center stack–signal strength should exceed -45 dBm; weaker readings point to a damaged coaxial cable at the roof mount.
Finding the Exact Electrical Blueprint for Your Sedan’s Configuration
Start by identifying the precise trim level of your vehicle–LS, SXT, R/T, Scat Pack, or Hellcat–as each variation includes distinct factory wiring systems that affect fuse panels, sensor locations, and connector pinouts. The official repair manual for the model year splits schematics into separate sections for base, mid-range, and performance trims, accounting for differences in powertrain control modules, infotainment interfaces, and advanced driver-assistance components. Access the manufacturer’s technical service portal using your VIN to pull the specific subsection matching your build sheet, which will list fuse ratings, wire gauge colors, and module identifiers unique to your configuration.
Key Areas to Cross-Reference
Check the harness routing under the dashboard, particularly around the junction block near the left kick panel–common points of failure for turn signal relays and climate control actuators fluctuate between trims. Compare the engine bay fuse box layout against your trim’s documentation; high-output variants often feature an additional 40-amp fuse for the supercharger bypass valve absent in lower trims. Rear lighting circuits also vary–LED assemblies in premium trims include separate ground paths and pulse-width modulation modules not present in halogen-equipped configurations.
Use a digital multimeter to probe connector pins while referencing the schematic’s pinout tables, which specify voltage ranges (e.g., 0–12V for signal circuits, 7–14V for power rails) and acceptable resistance values (
For offline reference, extract the PDF files from a factory repair DVD using the trim code printed on the compliance label (e.g., “WDZ” for SXT AWD). Search the document for “schematic” followed by the component name; the correct page will show wire color codes keyed to the harness–black with an orange tracer for the ignition feed on R/T models versus solid yellow on LS–alongside connector views mirroring the physical layout.
Decoding Electrical Schematic Color Standards
Start by identifying the ground symbols–these are typically marked with black lines or letters like “BLK” or “GND.” The same hue almost always denotes a shared common return path, so trace these first to establish baseline circuits before moving to active conductors.
Locate the power feed identifiers: solid red (often labeled “RED” or “+12V”) or orange (“ORG”) wires carry battery voltage directly. Confirm their routing through fuses or relays; interruptions here reveal fault zones quicker than chasing minor branches.
- Dark green (“DK GRN”) commonly denotes switched ignition inputs.
- Light blue (“LT BLU”) frequently handles sensor signal returns.
- Purple (“PPL”) tends to mark dedicated actuator feeds like fuel injectors.
- Gray (“GRY”) usually services illumination or dimmer circuits.
Match stripe patterns: a white wire with a red stripe (“WHT/RED”) differs from a red wire with a white stripe (“RED/WHT”). The primary color determines the base function, while the stripe adds context–typically denoting downstream branches or splices.
Cross-reference connector pinouts against component labels: a “TAN/YEL” wire in connector C201 pin 8 might map to the throttle position sensor, whereas the same hue elsewhere could lead to an entirely unrelated module.
Use heat shrink or printed labels on physical wires to verify schematic colors; factory tape wraps fade under UV exposure and can mislead during hands-on tracing.
- Isolate a single circuit segment starting from source (battery/fuse).
- Trace conductor hue toward the load component.
- Note every splice, connector, and color transition.
- Check voltage at each juncture during activation tests.
- Document deviations from schematic–these hint at aftermarket modifications or hidden failures.
Consult the legend box in the upper-right corner; it decodes suffixes like “-B” (shifter interlock) or “-K” (instrument cluster), clarifying otherwise ambiguous abbreviations.
Step-by-Step Guide to Tracing Specific Circuits (Ignition, Lighting, Audio)
Locate the fuse box under the dashboard or in the engine bay using the legend printed on its cover. Identify the relevant fuse for the circuit–ignition (slot 12, 20A), headlamps (slot 21, 15A), or audio system (slot 34, 10A)–then remove it with needle-nose pliers. Probe both terminals of the fuse socket with a multimeter set to DC voltage. A reading near 12V on one side confirms power feed; zero on both indicates a break upstream.
For ignition circuits: Trace the red/white wire from the fuse box to the ignition switch, marked “I” on the harness. Disconnect the switch, then probe the input (terminal 30) and outputs (terminals 15, 50) with the key in RUN and START positions. A drop below 11V suggests resistance in the switch or wiring; inspect for melted insulation or corrosion at connector C201 (near the firewall). Follow the output wires to the coil packs–terminal resistance should read 0.5–2.0 ohms.
Lighting circuits require splitting into high and low beams. Pull the headlight connector (Harness H101) and verify ground (black wire) continuity to chassis. For shorts, probe the yellow (low beam) and dark blue (high beam) wires with a load tester while toggling the switch. No voltage? Check the dimmer relay (REL1) in the under-hood box; swap with a known-good relay (e.g., horn relay) to isolate failure. Taillights follow the orange/white wire from fuse 25 to the trunk harness–examine splice S302 for fraying.
Audio systems: Start at the amp (trunk, right side). Confirm constant 12V on the red/pink wire (fuse 34) and remote turn-on (blue/white) from the head unit. No remote signal? Trace back to the stereo harness (C107) and verify the orange wire carries +12V in ACC mode. Speakers use twisted pairs: left front (gray/gray-black), right front (white/white-black), etc. Impedance should read 4±0.5 ohms–lower indicates a short, higher suggests a break. For pops/whines, add a ground isolator to the RCA cables and relocate the amp’s ground to a bare metal chassis point.