B3702 – Intermittent Wiper Delay Input Circuit Low (BCM)

System: Body | Standard: ISO/SAE Controlled | Fault type: Circuit Intermittent

Definition source: SAE J2012 naming/structure guidance (verify exact wording against your official DTC dataset)

What Does B3702 Mean?

B3702 – Intermittent Wiper Delay Input Circuit Low (BCM) is an ISO/SAE controlled body-system diagnostic trouble code that indicates the Body Control Module (BCM) has detected a circuit intermittent fault where the intermittent wiper delay input circuit signal drops low (below the expected level) at certain times.

This code is specific to the BCM’s monitoring of the driver request for intermittent/delay wiper operation. The BCM expects the delay input circuit to remain within a valid electrical range when the switch/controls command intermittent wipe. If the BCM sees the delay input circuit intermittently pulled low—due to an unstable connection, wiring fault, or input device issue—it stores B3702 and may alter or limit intermittent wipe behavior depending on vehicle logic.

Quick Reference

• Code: B3702
• Official title: B3702 – Intermittent Wiper Delay Input Circuit Low (BCM)
• System: Body
• Standard classification: ISO/SAE Controlled
• Fault type: Circuit Intermittent
• What the BCM detected: The intermittent wiper delay input circuit signal intermittently goes low
• Likely affected function: Intermittent (delay) wiper request recognition and delay timing

Symptoms

When B3702 sets, symptoms are related to intermittent wipe request and delay control reliability. Depending on how the BCM responds to an implausible/low input, symptoms may come and go.

• Intermittent (delay) mode inoperative: selecting intermittent does not produce the expected wipe behavior
• Incorrect delay timing: wipe interval may not match the selected setting
• Unstable intermittent wipe operation: intermittent wipes may start/stop unexpectedly
• Delay setting changes without driver input: the BCM may interpret the input as a different state when the circuit drops low
• Warning indicator or message (if supported): some vehicles may display a body-related warning or store the code without a visible warning

Common Causes

B3702 requires an intermittent low condition in the intermittent wiper delay input circuit seen by the BCM. Causes typically involve the circuit path between the driver control and the BCM, including terminals, wiring, and the input device.

• Intermittent short-to-ground: damaged insulation or harness contact that intermittently pulls the input circuit low
• Loose, spread, or backed-out terminal(s): intermittent connection at the switch connector, intermediate connector, or BCM connector
• Corrosion or moisture intrusion: corrosion increases resistance or creates leakage paths that can bias the signal low
• Harness damage at flex/movement points: partially broken conductor(s) that open/short intermittently with movement or vibration
• Poor ground or reference integrity for the input network: electrical return/reference problems that cause the BCM to see a lower-than-expected signal
• Faulty wiper control input device: internal wear/contamination in the control that intermittently outputs a low signal
• BCM input circuit concern: an internal BCM issue that intermittently misreads the input (consider only after external circuit verification)

Diagnosis Steps

Accurate diagnosis focuses on confirming the BCM is seeing an intermittent low signal and then isolating whether the drop occurs in the switch, wiring, connectors, or at the BCM input. Useful tools include a scan tool capable of BCM body codes and data, a digital multimeter, and the correct wiring diagram for the intermittent wiper delay input circuit.

1. Confirm the code in the BCM: verify B3702 is current or resets during testing. Record any additional body codes that may indicate shared power/ground or connector issues.
2. Check wiper operation: command intermittent/delay mode and adjust the delay setting through its range. Note whether the function is inoperative, inconsistent, or changes unexpectedly.
3. Review available failure records: if the BCM provides failure records or event data, note conditions when B3702 set (such as wipers on/off state and timing).
4. Inspect the driver control area and harness routing: examine the steering column/dash harness routes for pinch points, chafing, previous repairs, or areas where movement can stress wiring.
5. Inspect connectors and terminals: check the wiper control connector(s) and BCM connector for moisture, corrosion, terminal damage, poor locking, or pin fitment issues. Reseat as needed and ensure proper terminal retention.
6. Monitor the input with scan data (if available): view the BCM parameter(s) related to the intermittent/delay request while operating the control. Look for dropouts, unexpected state changes, or an indicated low state when it should be valid.
7. Back-probe and measure the circuit: using the wiring diagram, test the intermittent wiper delay input circuit at the BCM connector. Compare measured signal behavior to expected changes when the control is operated.
8. Wiggle test for intermittency: while monitoring the meter and/or scan data, gently move the harness and connectors (especially at flex points). If the signal drops low during movement, narrow the location by testing closer to the switch and then closer to the BCM.
9. Check for short-to-ground: with the circuit in a safe test state per service information, verify the input circuit does not show intermittent continuity to ground when the harness is manipulated.
10. Verify ground/reference integrity: perform voltage drop testing on relevant grounds and shared feeds used by the control/input network. An unstable reference or ground can bias the input low intermittently.
11. Evaluate the input device only after wiring checks: if wiring/terminals test good and the low condition can be observed originating at the control output, the control becomes the primary suspect.
12. Consider BCM only after external verification: if the input signal at the BCM pins remains correct and stable during the fault reproduction attempt but B3702 continues to set, re-check connector pin fitment, BCM power/ground, and only then consider BCM input circuitry.

Possible Fixes

• Repair wiring damage in the intermittent wiper delay input circuit (chafing, pinched sections, partially broken conductors)
• Correct intermittent short-to-ground sources by restoring insulation and securing harness routing
• Clean/dry and reseat connectors and correct terminal issues (corrosion removal, terminal replacement, restoring terminal tension as applicable)
• Repair ground or reference/feed issues affecting the wiper delay input circuit’s electrical stability
• Replace the wiper control input device if testing confirms it intermittently outputs a low signal on the delay input circuit
• Service the BCM (repair/replace/reprogram as required) only after proving the external circuit and input device are correct and stable at the BCM connector

Can I Still Drive With B3702?

Driving may be possible, but B3702 can affect wiper reliability because it involves the intermittent wiper delay input recognized by the BCM. If intermittent wipe function becomes erratic or unavailable, visibility can be reduced in precipitation, spray, or changing conditions.

If the wipers do not respond predictably in intermittent/delay mode, the vehicle should be considered unsafe to operate in conditions that require dependable wiper control. Addressing the cause promptly is recommended because intermittent circuit faults can worsen as terminal contact quality or wiring damage progresses.

Last updated: March 22, 2026