Every control module on the 2021-2026 Toyota Sienna — 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.
Transmission Control Module (TCM) 2.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Integrated within transmission assembly, passenger side of engine bay
🔧 Toyota Techstream with TIS subscription
⚠️ Requires transmission removal or partial disassembly; VIN registration and adaptive learning reset required
Hybrid Vehicle Control ECU / Battery ECU (HV ECU) 2.0 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Engine compartment, passenger side near hybrid battery or under rear cargo area
🔧 Toyota Techstream with TIS subscription
⚠️ Hybrid models only (all 2021+ Siennas are hybrid); high-voltage system isolation required; VIN and battery pack pairing mandatory
Power Sliding Door ECU / Multiplex Network Door ECU (DOOR ECU) 2.0 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Inside each sliding door panel (left and right separate modules)
🔧 Autel, Launch, or Techstream
⚠️ Separate modules for left and right doors; initialization and limit learning required
Rear Seat Entertainment System ECU (RSE ECU) 2.0 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Behind overhead console or integrated with rear display units
🔧 Autel, Launch, or Techstream
⚠️ Optional rear entertainment system; usually self-initializes; may require configuration for wireless headphones
ABS Actuator / Brake Control Module (ABS) 1.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Engine compartment, driver side near master cylinder
🔧 Toyota Techstream with TIS subscription
⚠️ Brake bleeding required after replacement; VIN registration needed
Air Conditioning Amplifier / HVAC Control Module (A/C AMP) 1.5 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Behind center dash, integrated with climate control panel or behind glove box
🔧 Autel, Launch, or Techstream
⚠️ Basic initialization usually sufficient; tri-zone configuration may require dealer tool
Power Back Door ECU (PBD ECU) 1.5 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Inside liftgate panel, driver side
🔧 Autel, Launch, or Techstream
⚠️ Height adjustment and limit learning required after replacement
Occupant Detection ECU / Seat ECU (ODS ECU) 1.5 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Under front passenger seat, integrated with seat frame
🔧 Toyota Techstream with TIS subscription
⚠️ Occupant classification system; calibration required; affects airbag deployment
Body Control Module / Multiplex Network Body ECU (BCM) 1.5 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Behind driver side lower dash panel, above fuse box
🔧 Toyota Techstream with TIS subscription
⚠️ Controls power sliding doors, lighting, and body functions; extensive configuration required for options
Pre-Collision System Millimeter Wave Radar / TSS 2.0 ECU (PCS RADAR) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind front grille, center lower area (Toyota Safety Sense 2.0)
🔧 Toyota Techstream with TIS subscription
⚠️ Radar aiming and calibration required after replacement; TSS 2.0 standard on all trims
Electric Power Steering Control Module (EPS ECU) 1.3 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Steering column area, behind lower dash or integrated with steering column assembly
🔧 Toyota Techstream with TIS subscription
⚠️ Steering angle sensor calibration required after replacement
Engine Control Module / Powertrain Control Module (ECM/PCM) 1.2 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Engine compartment, driver side firewall area, mounted on bracket near strut tower
🔧 Toyota Techstream with TIS subscription
⚠️ VIN registration and immobilizer pairing required; seed-key authentication needed; hybrid models have integrated hybrid control
Gateway ECU / Communication Gateway (GATEWAY) 1.2 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind driver side lower dash or integrated with BCM
🔧 Toyota Techstream with TIS subscription
⚠️ Manages CAN bus communication between networks; VIN registration required; enhanced security on 2021+
Adaptive Front Lighting System ECU / Auto Leveling ECU (AFS ECU) 1.2 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Behind headlight assembly or integrated within headlight (each side if separate)
🔧 Autel, Launch, or Techstream
⚠️ Auto-leveling calibration required; LED models have integrated modules
Audio / Multimedia / Navigation System (RADIO/NAV) 1.2 hr R&R relearn only +0.3 hr ▸ programming details
📍 Center dash, integrated in center stack
🔧 Vehicle self-initialization or Techstream
⚠️ Entune 3.0 / Audio Multimedia system; usually self-initializes on network; OTA update capable
SRS Airbag Control Module (SRS ECU) 1.0 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Center console area, under front seats or center floor tunnel
🔧 Toyota Techstream with TIS subscription
⚠️ Crash data must be cleared; occupant classification system calibration required
Forward Recognition Camera / TSS Camera ECU (FR CAMERA) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind windshield, top center near rearview mirror
🔧 Toyota Techstream with TIS subscription
⚠️ Windshield camera for TSS 2.0; windshield replacement requires recalibration; static and dynamic calibration needed
Smart Key ECU / Immobilizer ECU (SMART KEY/IMM) 1.0 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Behind lower dash, driver side near steering column or center console area
🔧 Toyota Techstream with TIS subscription
⚠️ All keys must be re-registered; security seed-key authentication required; cannot be bypassed
Parking Assist ECU / Clearance Sonar ECU (PA ECU/SONAR) 1.0 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Behind rear bumper, center or driver side
🔧 Autel, Launch, or Techstream
⚠️ Sensor calibration may be required; usually self-learns
Data Communication Module / Telematics Control Unit (DCM) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind center dash or under front passenger seat
🔧 Toyota Techstream with TIS subscription
⚠️ Safety Connect / Service Connect / Remote Connect; requires dealer activation and subscription pairing; 4G LTE on 2021+
Combination Meter / Instrument Cluster (METER) 0.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Instrument panel, behind steering wheel
🔧 Toyota Techstream with TIS subscription
⚠️ Mileage programming required; VIN registration mandatory; digital cluster on higher trims
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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