2.9.5 BIM-22-3 (Tire Pressure Monitoring System)¶

Dakota Digital BIM-22-3 TPMS

Type: Tire Pressure Monitoring System (TPMS)

Model: BIM-22-3

Manufacturer: Dakota Digital

Product Page: Tire Pressure Monitoring System

Overview¶

Wireless TPMS module displaying real-time tire pressure for all four wheels on HDX dashboard message center. Includes 4 wireless valve stem sensors.

Mounting: HDPE panel on firewall (behind dashboard)

Power: Via BIM/IO cable from HDX control box (no separate power wiring)

Specifications¶

Sensors Included: 4x wireless valve stem sensors
Maximum Sensors: 4 (fixed - cannot add spares)
Sensor Type: Dismount-to-install valve stem replacement
Communication: Wireless RF (sensors → BIM-22-3 receiver)
Display: Dashboard message center shows all 4 tire pressures
Programming: Sensors easily reprogrammed via Bluetooth app
Current Draw: Negligible — bus-powered via the HDX BIM/IO cable (no separate feed); draw is included in the HDX system budget on PMU OUT9 (25A cap, ~12A typ). Dakota Digital publishes no per-module current for these data modules (only power modules like the BIM-RGB, 7.4A, list a figure).
Compatibility: HDX, RTX, GRFX systems (limited VFD3/VHX compatibility)

Display Integration¶

Dashboard Message Center:

Displays all 4 tire pressures simultaneously
Pressure units: PSI (configurable)
Low pressure threshold: User-configurable via Bluetooth app
Visual warnings for low pressure conditions

Tire Rotation:

Sensors remain with wheels during rotation
Reprogram sensor assignments via Bluetooth app after rotation

Wiring¶

Connection	Source	Destination	Wire Gauge	Notes
Constant	Critical Cabin PDU Slot 5 (TBD #144)	BIM-22-3 power	18 AWG ✓	BIM CONSTANT power — may be bus-powered via BIM/IO cable instead
BIM/IO	HDX control box	BIM-22-3 input	Proprietary	Data via daisy-chain
Sensors	Wireless	BIM-22-3 receiver	-	No wiring - RF communication

No External Wiring:

Sensors communicate wirelessly with BIM-22-3 receiver module
BIM-22-3 powered via BIM harness from HDX control
Clean installation - no wiring to wheels or suspension

Outstanding Items¶

🔴 Critical (2)

Gauge cluster power architecture: PMU OUT9 vs Critical Cabin PDU slots (#144) — Two mutually exclusive power architectures are documented for the Dakota Digital gauge system and must be reconciled before the cluster can be wired:
Dedicated brushless radiator-fan controller + coolant temp sensor selection (#134) — Moving the GM 84100128 radiator fan off the PMU (OUT2+3+4) onto START-battery-direct power requires a standalone brushless-fan PWM controller with its own coolant temperature sensor, independent of the PMU and the J1939 bus.

High (7)

iBooster pedal ratio verification against 1.25" booster stroke (#301) — Verify the brake pedal ratio (approximately 4:1 per owner notes, 03-06 TJ/LJ auto pedal) against the Bosch Gen 2 iBooster's 1.25" stroke so the pedal reaches full booster travel without the cylinder bottoming, with the 1-1/8" Wilwood master and Super Duty calipers at all four corners. Bench-measure on assembly.
Gear position display via J1939 (Turbolamik TCU → BIM-01-2 → HDX) (#110) — Verify that transmission gear position actually reaches the HDX dash over J1939 — and is displayed — without a discrete gear-position sender.
Brake Proportioning Valve (#60) — Select adjustable proportioning valve for the rear disc circuit (iBooster has no integral proportioning); size on assembly
Catch Can Mounting Bracket Point (#58) — Select engine bracketry attachment point for Mishimoto MMOCC-UB universal bracket
AMOT Cable Firewall Grommet (#57) — Assign dedicated firewall grommet for AMOT push-pull cable pass-through (must not share with other cables)
AMOT T-Handle Mounting Location (#56) — Select dash mounting position for Midwest Control 30-144-TTL-BH-3 (reachable belted, away from accidental contact)
AMOT-to-Intake Adapters (#55) — Source NPT-to-hose fittings sized to match measured turbo inlet OD

📋 Medium (3)

Horn button → PMU In 1 wiring path through steering column (#152) — PMU In 1 (horn request) lists "steering wheel button" as its source, and the horn page puts the button on the steering-wheel PTT bracket — but no wire path, gauge, or connector is defined for how the button contact reaches PMU In 1 through/around the steering column. Street-legal item with an under-specified signal path.
iBooster Wiring Harness Selection (#105) — Select the Bosch iBooster (Gen 2) wiring harness: Tulay's Gen 2 universal (plug-and-play) vs EVcreate Gen 2 connector kit (DIY). Decision pending donor arrival and pigtail condition inspection. Tracked in the purchase tracker but was missing a TBD issue.
Axle Brake Flex Hose Length (#86) — DOT (FMVSS 106) braided-stainless extended-length flex at each axle - length blocked on axle + suspension selection (Section 10); size to full droop, do not cut until ride height fixed

🔍 Verify (5)

iBooster standby current spec (ignition-off test value) (#151) — The engine-systems testing checklist includes "Verify iBooster standby current within spec (ignition OFF)" but no standby-current spec value is documented anywhere (the brake-booster page does not state one). The test step cannot be completed as written.
WAIT-to-start lamp polarity: ECM Pin 35 active-low vs HDX input active-high (#150) — ECM Pin 35 (WAIT lamp, yellow) is active LOW (~0V when WAIT on, ~+12V off); the HDX indicator input is documented as active HIGH. If wired without resolving this, the cold-start indicator reads inverted — and the documented cold-start procedure depends entirely on watching the WAIT lamp.
Restomod Air HVAC integration — verify A/C request wiring to PMU In 9 + blower draw (#146) — The factory TJ HVAC is replaced by a custom Restomod Air electronic HVAC kit (ordered, owner-confirmed 2026-06-11) — this resolves the original "no A/C request source post-PCM-delete" gap. Restomod Air kits are fully electronic (servo-driven doors, no vacuum), and the control head generates the A/C request: compressor-engage output (12V) → trinary pressure switch (30/406 psi cutouts) → PMU In 9. PMU logic then drives OUT17 → compressor clutch.
AMOT 4261M 2.8″ intake air-path connection OD / reducer coupler to 2.125″ turbo inlet (#129) — The 4261M02 is a wafer butterfly valve that sleeves into a 2.8″ (71 mm) nominal intake duct; the AMOT datasheet (4261M_Air_Shutoff_Valve_0119rev2) publishes only nominal size (71 mm), bore (61 mm / 2.4″), and overall envelope — not the air-path spigot/wafer OD or clamp interface. The NPT thread in part number 4261M02A027-AA (actuator code 27) is the pneumatic control port, not the air path.
Grid Heater Current (#42) — Design value 80A - verify via element resistance measurement during installation (~0.15 ohm @ 12V).

Build Tasks¶

Confirm TPMS sensor compatibility with wheel/tire setup (valve stem hole size)
Determine sensor battery life and replacement procedure

Dakota Digital System Overview - Complete system architecture
Dashboard Cluster - Displays TPMS data in message center
HDX Control Module - Bluetooth app for sensor programming