B3062

Code

Generic B — Body

Seat Control Module Communication Fault

Brand: Generic

Type: B — Body

Views: UK: 8 EN: 26 RU: 7

AI status

Completed

ready

Completed 100%

Page language: EN

Open or short in CAN/LIN communication wiring
Loose, corroded or damaged connector at the seat control module
Faulty seat control module (internal failure)
Loss of module power or ground
Network termination/resistance problem or wiring harness damage after recent service or collision
Intermittent wiring or connector fault (movement of seat changes condition)

Use a scan tool to read freeze frame data, module status, and any network error counters
Visually inspect seat control module connectors and wiring for corrosion, damage, or pin push-out
Check related fuses and relay feeding the seat control module
Wiggle-test wiring harness while observing live data or communication status to find intermittent faults
Inspect nearby components and harness routing for chafing, pinch points, or post-collision damage
Check for other DTCs on the same communication bus that may indicate a different failing module

Module supply voltage (key ON): ~11–14.5 V
Module ground:
CAN bus idle recessive level: ~2.5 V on CAN_H and CAN_L
CAN bus dominant level: CAN_H ~3.5 V, CAN_L ~1.5 V (differential ~2.0 V)
LIN bus idle: near battery voltage via pull-up; dominant low ~0 V (if vehicle uses LIN)
Bus termination: total differential resistance across CAN bus typically ~60 ohms (120 ohm resistors at each end)

Retrieve DTCs and note occurrence frequency and freeze frame. Check for supporting DTCs on CAN/LIN or gateway modules.
Confirm battery voltage is within spec. Verify fuses/relays supplying SCM are intact and connectors are secure.
With IGN ON, use a scan tool to try to communicate with the seat control module. Note if module appears, times out, or returns errors.
If module fails to respond, visually inspect and disconnect the SCM connector(s). Check pins for corrosion, bent pins or pushed-out terminals. Reconnect and retry communication.
Backprobe or measure supply and ground at the SCM connector: verify ~11–14.5 V supply and good ground. Repair any power/ground faults.
Probe CAN/LIN lines at the SCM while comparing to reference module or service manual: verify recessive/dominant voltages and differential. Repair wiring or connectors if levels are out of range or noisy.
Perform wiggle tests of harness, seat movement (with occupant removed and safety precautions) and connectors while monitoring bus traffic for intermittent dropouts.
If wiring and power/ground are good but communication still fails, check termination resistances and other modules on the same bus for faults.
If all vehicle-side wiring and bus integrity are confirmed, consider module failure. Replace or reprogram replacement SCM per manufacturer procedure and erase codes, then verify repair.
After repair, clear codes and perform a functional test of seat features and monitor the bus for reappearance of B3062.

Damaged connector or pin at the seat control module
Broken or shorted CAN/LIN data wires between SCM and Body Control Module (BCM) or gateway
Blown fuse or fused power supply to the SCM
Faulty SCM not responding to bus traffic