Every control module on the 2023-2026 Toyota bZ4X — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Battery Management ECU (BMS-ECU) 4.5 hr R&R dealer / factory tool +1.5 hr ▸ programming details
📍 Integrated with high-voltage battery pack, under floor center tunnel
🔧 Toyota Techstream with TIS subscription
⚠️ Requires high-voltage isolation, battery pack partial disassembly; coding includes cell balancing calibration and capacity registration
Air Conditioning Amplifier (A/C AMP) 2.5 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Behind center instrument panel, integrated with HVAC unit
🔧 Autel/Launch or Techstream
⚠️ Heat pump system on BEV; requires refrigerant recovery and actuator relearn
Hybrid Vehicle Control ECU (HV-ECU) 2.5 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Under hood, center firewall area behind motor assembly
🔧 Toyota Techstream with TIS subscription
⚠️ Primary powertrain controller for BEV system; requires VIN registration, system initialization, and high-voltage safety lockout procedures
Electric Power Steering Control Module (EPS-ECU) 2.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Integrated with steering column assembly, under instrument panel
🔧 Toyota Techstream with TIS subscription
⚠️ Requires steering angle sensor calibration and torque sensor zero-point learning
Electric Transaxle Control Module (ETCM) 2.0 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Mounted on electric motor/transaxle assembly, under hood
🔧 Toyota Techstream with TIS subscription
⚠️ Controls motor inverter and reduction gear; requires motor position sensor calibration after replacement
Steering Angle Sensor (SAS) 1.5 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Integrated with EPS column assembly
🔧 Autel/Launch or Techstream
⚠️ Requires zero-point calibration after steering or suspension work; critical for VSC/TSS
Brake Actuator / Skid Control ECU (ABS/VSC ECU) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Under hood, left front corner near brake master cylinder
🔧 Toyota Techstream with TIS subscription
⚠️ Integrated with regenerative braking system; requires brake bleed and system initialization after replacement
Multimedia Display / Audio Control Module (RADIO/NAV) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Center instrument panel, 12.3-inch or 8-inch display
🔧 Toyota Techstream with TIS subscription
⚠️ Requires VIN registration and vehicle configuration; navigation data separate from module
4WD Control ECU (4WD-ECU) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Under vehicle, near rear motor assembly (AWD models only)
🔧 Toyota Techstream with TIS subscription
⚠️ AWD models only; controls rear electric motor engagement; requires motor position sensor calibration
Body Control Module (BCM) 1.2 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind lower left instrument panel, above driver kick panel
🔧 Toyota Techstream with TIS subscription
⚠️ Requires VIN registration and vehicle configuration coding for options
Multiplex Network Door ECU (DOOR-ECU) 1.2 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Inside each front door (driver/passenger)
🔧 Autel/Launch or Techstream
⚠️ Controls power windows, mirrors, locks per door; requires window auto-up/down relearn
Pre-Collision System Millimeter Wave Radar (PCS-RADAR) 1.2 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Behind front grille, center lower position
🔧 Toyota Techstream with TIS subscription
⚠️ Requires radar aiming and calibration with alignment equipment; part of Toyota Safety Sense
Data Communication Module (DCM) 1.2 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Under instrument panel, center or left side, or behind glove box
🔧 Toyota Techstream with TIS subscription
⚠️ Handles Toyota Connected Services and OTA updates; requires VIN and subscription activation
Smart Key ECU (SMART KEY) 1.0 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Behind lower center instrument panel, above transmission tunnel
🔧 Toyota Techstream with TIS subscription
⚠️ All smart keys must be re-registered; requires security code from Toyota; cannot clone keys without dealer access
SRS Airbag Control Module (SRS-ECU) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Under center console, between front seats
🔧 Toyota Techstream with TIS subscription
⚠️ Requires VIN registration and crash data clear; verify all airbag connectors seated before coding
Forward Recognition Camera ECU (FRC-ECU) 1.0 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Behind windshield, top center near rearview mirror
🔧 Toyota Techstream with TIS subscription
⚠️ Monocular camera for TSS 2.5; requires static calibration after windshield or camera replacement
Communication Gateway ECU (CGW) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind lower left instrument panel, near BCM
🔧 Toyota Techstream with TIS subscription
⚠️ Central CAN gateway; requires VIN registration and network configuration
Power Back Door ECU (PBD-ECU) 1.0 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Inside liftgate, left or right side
🔧 Autel/Launch or Techstream
⚠️ Requires height position relearn and pinch detection calibration
Combination Meter (METER) 0.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Instrument panel, behind steering wheel
🔧 Toyota Techstream with TIS subscription
⚠️ Requires VIN and odometer registration; mileage transfer from old unit mandatory
Adaptive Front Lighting System ECU (AFS-ECU) 0.8 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Behind left or right headlight assembly
🔧 Autel/Launch or Techstream
⚠️ Controls LED adaptive headlights; requires aiming calibration after replacement
Clearance Sonar / Parking Assist ECU (SONAR-ECU) 0.8 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Behind rear bumper, center or left side
🔧 Autel/Launch or Techstream
⚠️ Requires sensor calibration after replacement
Power Seat Control ECU (SEAT-ECU) 0.8 hr R&R relearn only +0.2 hr ▸ programming details
📍 Under driver and/or passenger seat
🔧 Autel/Launch or Techstream
⚠️ Requires seat position memory relearn; ventilation/heating function included
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour?
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