Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC 73: Mechanical Lock Not Detected Error: Procedure
2013 Toyota Sienna LE, AWDSECTION Procedure
- CHECK INSTALL PARTS CORRECTLY (SEAT TURN LOCK PLATE SUB-ASSEMBLY)
- Remove the auto access seat unit. Refer to REMOVAL .
- Disassemble the auto access seat unit until it is in the condition shown in the illustration. Refer to DISASSEMBLY .
- Using a vernier caliper, adjust the position of the seat turn lock plate to the specifications below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TEXT IN ILLUSTRATION*1 Seat Turn Lock Plate Sub-assembly - - Standard
Location Standard Length A 244.5 to 245.5 mm
(9.626 to 9.665 in.)B 256.2 mm
(10.087 in.)C 266.6 mm
(10.480 in.)D 120.3 to 121.3 mm
(4.736 to 4.776 in.)
NG → See step 3
OK → See step 2
- REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to DISASSEMBLY - Step 2
- ADJUST OR REPLACE SEAT TURN LOCK PLATE SUB-ASSEMBLY. Refer to REASSEMBLY - Step 7
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.