DIYAUTOFIXESMANUALS

Diagnostic Trouble Code Database

B1620Low (Safe to Drive)

Wiper Rear Low Limit Input Circuit Open

System:Body Systems (Lighting, Windows & Comfort)•Classification:Body (OBD-II Generic)•Severity Impact:Body accessory circuit fault. Standard driving dynamics unaffected.
Direct Technical Definition (Fast Answer)

Code B1620 indicates a diagnostic fault in the Body Systems (Lighting, Windows & Comfort) (Wiper Rear Low Limit Input Circuit Open). Connect an OBD2 scanner to verify freeze frame data, then test circuit voltage and vacuum connections before replacing components.

Estimated Repair Time30 – 60 minutes
DIY Parts Cost$15 – $55
Shop Repair Quote$120 – $280
Average DIY SavingsSave $200+
The 80/20 Workshop Rule

Inspect the electrical harness and ground connection related to B1620. Clear the code with an OBD2 scanner; if it returns, perform a multimeter resistance check on the primary sensor.

Estimated DIY Cost
$15 – $55
Tools & DIY parts
Dealership Shop Quote
$120 – $280
Labor ($180/hr) + parts
Net Money Saved
Save $200+
In your driveway today

Symptoms Associated with B1620

Drivers typically observe the following symptoms when the ECM flags B1620:

Check Engine Light (MIL) illuminated on instrument cluster
Possible engine performance, hesitation, or emission monitor reset
Failed annual vehicle safety or emissions smog inspection

Common Root Causes & Statistical Probability Matrix

Statistical breakdown of what triggers this code based on automotive repair shop data.

Worn, contaminated, or defective Wiper Rear Low Limit Input Circuit Open component
High ProbabilityDifficulty: Moderate
Relative Frequency: 75%Estimated Parts Cost: Low
Damaged, loose, or corroded wiring harness connector pins
Medium ProbabilityDifficulty: Easy
Relative Frequency: 45%Estimated Parts Cost: Low
Underlying vacuum leak, blown fuse, or poor chassis ground
Low ProbabilityDifficulty: Easy
Relative Frequency: 20%Estimated Parts Cost: Low

Step-by-Step Diagnostic & Repair Procedure

Follow this logical order to isolate and repair B1620 before spending money on costly parts.

Checklist Progress: 0 of 3 steps complete

Step 1: Scan and Record Freeze Frame Data

Connect an OBD2 scanner, record engine RPM, coolant temp, and secondary DTCs associated with B1620.

Step 2: Visual Inspection

Inspect wiring harnesses, pins, and vacuum lines related to the Body Systems (Lighting, Windows & Comfort) for chafing, oil contamination, or burn marks.

Step 3: Multimeter / Component Verification

Measure 12V reference power, ground continuity, and signal voltage against factory service manual specifications for B1620.

Frequently Asked Questions About B1620

Severity is rated as Low. Body accessory circuit fault. Standard driving dynamics unaffected.