International SA 33 SPN 2642 FMI 5: Left Mirror Heat Undercurrent

SA 33 SPN 2642 FMI 5 on International / Navistar trucks means: Left Mirror Heat Undercurrent. The failure mode (FMI 5) is “current below normal or open circuit”.

Code details

Manufacturer: International (Navistar)
Applies to: International / Navistar body controller (ESC) and multiplexed modules
Fault code: SA 33 SPN 2642 FMI 5
J1939 SPN: 2642
FMI: 5 — Current below normal or open circuit
Reporting module: Body Controller (source address 33)
Component / signal: Mirror Heat 1
Truck models in source: 3200, 4100, 4300, 4400, 7300, 7400, 7500, 7600, 7700, 8500, 8600, BE 200, CE Bus, CXT, DuraStar, LoneStar, MXT, ProStar, RXT, TranStar, WorkStar
Connector pins: 1603-H
Logical signal: Left_Mirror_Heat_Cmd

Cause and when it sets

Cause: Open in Left Mirror Heat Circuit

What to do next

Read active and inactive codes with the OEM service tool (Diamond Logic Builder can clear previously active codes) and note the occurrence count.
FMI 5 tells the shop the type of failure to test for: current below normal or open circuit.
Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.