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Home / DTC / B1764 — Wiper switch

B1764 — Wiper switch

Detailed page for trouble code B1764.

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Code

B1764

MITSUBISHI B — Body

Wiper switch

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty wiper switch (column or stalk switch)
  • Open, shorted or corroded wiring/connector between switch and wiper relay/BCM
  • Blown fuse or defective wiper relay
  • Faulty Body Control Module (BCM) / wiper control module
  • Poor ground or battery supply to switch
  • Intermittent contact due to contamination or wear

Symptoms

  • Wipers do not operate or are inoperative in one or more switch positions
  • Only one speed works (low or high) or intermittent/interval function fails
  • Wipers operate erratically or run continuously
  • Instrument cluster or BCM shows B1764 stored and possibly other related codes
  • No response when using the wiper stalk, or intermittent operation

What to check

  • Read freeze frame and stored DTCs with a diagnostic scan tool; note conditions when code set
  • Check fuses and wiper relay for continuity and correct operation
  • Visually inspect wiring and connectors at the wiper switch, steering column, and BCM for damage, corrosion, or loose pins
  • Verify battery voltage at the switch power input with ignition ON
  • Check ground integrity for switch and BCM
  • Operate the switch while observing connector voltages or continuity to confirm outputs change with each position

Signal parameters

  • Battery voltage (~12 V) present at the switch common/power terminal with ignition ON
  • 0 V (ground) or battery voltage measured on individual switch output terminals depending on selected position (OFF/LOW/HIGH/INT)
  • Continuity between switch terminals and corresponding wiring harness pins in each switch position (near 0 Ω for closed contacts)
  • Intermittent mode may pulse voltage to the wiper control input — verify with oscilloscope or scan tool if available
  • Typical open-circuit (infinite Ω) on outputs when switch is in OFF position

Diagnostic algorithm

  1. Verify the code: clear DTCs and attempt to reproduce B1764. Note if it returns and under what conditions (IGN on, wipers operated, ambient conditions).
  2. Check fuses and the wiper relay. Replace or swap relay with known-good unit and recheck.
  3. Visually inspect connectors and wiring at the wiper switch, steering column, and BCM for corrosion, bent pins, or damage. Wiggle harness while observing for intermittent faults.
  4. With ignition ON, backprobe the switch connector: confirm battery power at switch input and verify each output terminal changes state for OFF/LOW/HIGH/INT positions. Use a DVOM or scope.
  5. Measure continuity/resistance between switch terminals and the corresponding pins at the BCM/relay harness to find opens or high resistance. Repair any damaged wires.
  6. If switch outputs are incorrect but wiring to BCM/relay is good, remove and bench-test the switch for proper contact operation or replace the switch assembly.
  7. If switch bench-test is OK and wiring is good but the BCM does not see correct signals, inspect BCM power/grounds and reflash/update software if applicable. Consider BCM replacement only after wiring and switch are confirmed good.
  8. After repairs, clear codes and perform functional test cycles of all wiper positions to confirm the fault is resolved.

Likely causes

  • Internal failure of the wiper stalk/switch (most common)
  • Damaged connector pins or harness chafe at steering column
  • Relay stuck or contacts burned (affecting expected signal)
  • Corrosion at switch terminals or inline connector
  • Loose ground or low battery voltage affecting switch signalling

Fault status

⚠️ Status
Wiper switch circuit malfunction detected — abnormal or missing signal from the wiper switch.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1760 B1761 B1762 B1763 B1765
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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