B1702

Code

Other B — Body

Seat Driver Recline Forward Switch Circuit Open

Brand: Other

Type: B — Body

Views: UK: 22 EN: 43 RU: 35

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Page language: EN

Causes

Open or broken wiring between the recline forward switch and seat control module/BCM
Corroded, loose or damaged connector at the switch or module
Failed recline forward switch (mechanical/electrical)
Blown fuse or poor power/ground to the seat control circuit
Faulty seat control module or BCM input circuit
Aftermarket equipment, prior repair damage, or pinched wiring harness

Symptoms

Driver seat does not recline forward when switch is operated
No audible actuator movement or partial/unresponsive seat recline operation
Diagnostic trouble code B1702 stored; possible other seat-related codes present
Intermittent operation or only works when manipulating wiring/switch

What to check

Read DTCs and freeze frame with scan tool; note any related seat or airbag codes
Visually inspect seat switch, mounting and harness for damage, corrosion, loose connectors or pinched wires
Check fuses and seat power/ground circuits per manufacturer fuse diagram
Backprobe the recline forward switch connector and seat control module connector while operating switch
Perform continuity check between the switch terminal and the module input with connectors disconnected (key off)
Wiggle harness and operate switch to check for intermittent faults

Signal parameters

Switch type: usually a simple contact that changes between open and closed states when pressed
Expected behavior: closed continuity between switch terminal and seat module input when actuated; open when released
Voltage levels vary by vehicle: either a ground switched input or a VREF/Vb returned to module — typical ranges ~0–5V for signal circuits or 0–12V for battery-switched circuits (consult vehicle wiring diagram)
Resistance: pressed = near 0 Ω (continuity), released = infinite Ω (open)

Diagnostic algorithm

Obtain full code list and vehicle service manual/wiring diagram for the seat recline circuit
Verify manufacturer safety procedure for working near seat wiring/occupant restraint systems before beginning
Visually inspect switch, connectors and harness routing at seat and under trim for damage or loose connectors
With ignition on, backprobe the switch connector and observe signal while operating the recline forward switch; note if signal toggles
If no signal, disconnect switch and measure continuity across switch terminals with multimeter while actuating; replace switch if no continuity when pressed
If switch tests good, check continuity from switch harness pin to seat control module input pin (key off). Repair open circuit if found
Check for proper power and ground at the seat control/seat module connectors; repair poor ground or missing power
If wiring and switch are good, test/replace the seat control module or repair the module input circuit as directed by manufacturer diagnostics
Clear codes, cycle ignition, and verify proper operation and that code does not return
If intermittent, perform a wiggle test while monitoring signal and consider securing harness or replacing damaged sections

Likely causes

Wiring damaged where harness passes through seat frame or door sill (pinch/abrasion)
Connector terminals pushed out, corroded, or contaminated at the switch
Failed internal switch contacts due to wear/contamination
Connector not fully seated after seat removal or service

Fault status

⚠️ Status

B1702 — Driver seat recline forward switch circuit open. Open circuit detected between switch and seat control module; inspect switch, connectors, harness and module input.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–2.0 hours