B1690 Code: Meaning, Symptoms, Causes & Fix

Overview

B1690 is triggered when monitoring logic identifies an issue with Autolamp Delay Circuit Open affecting body electronics and comfort modules.

Symptoms

related warning lamp illuminated
battery draw complaints
feature inoperative intermittently

Common causes

Open circuit in wiring affecting autolamp delay circuit open
Disconnected or loose connector
Connector pin damage/corrosion or harness stress near related components

How to diagnose B1690

Confirm B1690 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to autolamp delay circuit open for obvious defects.
Use a continuity test from module pin to component to identify opens/high resistance.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code B1690

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with B1690?

Most vehicles can be driven short-term with B1690, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (open) in the autolamp delay circuit open circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify B1690 remains cleared under the conditions that originally set the code.

Fix options

Clear corrosion and protect terminals.
Restore continuity and verify pin tension.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$160-$850

Common mistakes when diagnosing B1690

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

B1690 in common vehicles

B1690 appears across makes such as Nissan, Hyundai, Kia, Volkswagen. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes B1690?

B1690 is commonly set by open faults affecting autolamp delay circuit open.

How much does it cost to fix B1690?

For B1690, repair costs are typically $160-$850 depending on exact root cause, labor rates, and part quality.

Can I clear B1690 without repair?

You can clear B1690 temporarily, but the code usually returns until the underlying fault is corrected.