Autolamp Delay Circuit Open

What it means

B1690 means the body control module cannot detect current flow in the Autolamp Delay circuit: the circuit is electrically open somewhere between the module, the connector and the component.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

Symptoms

• The affected function (lighting, locking, windows, seats, climate or restraint) does not work or works intermittently
• Warning light or message on the instrument cluster
• Possible battery drain if a module stays awake

Common causes

1. Damaged, chafed or corroded wiring in the Autolamp Delay circuit
2. Corroded, loose or water-damaged connector terminals
3. Failed Autolamp Delay component (sensor, solenoid or actuator)
4. Poor ground connection for the module or component
5. Faulty control module driver (rare, confirm all else first)

How to diagnose

1. Read freeze frame data and note when the code set (cold start, under load, after rain)
2. Inspect the Autolamp Delay connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
3. Measure supply voltage and ground at the connector with the key on
4. Check the signal wire for shorts to ground or battery and for continuity to the control module
5. Test or substitute the Autolamp Delay only after wiring and connectors are confirmed good
6. Clear the code and complete a drive cycle to confirm the repair

Related codes

Nearby codes in this group

• B1689Autolamp Delay Circuit Failure
• B1691Autolamp Delay Circuit Short To Battery
• B1688Lamp Dome Input Circuit Short To Ground
• B1692Autolamp Delay Circuit Short To Ground
• B1687Lamp Dome Input Circuit Short To Battery
• B1693Autolamp On Circuit Failure
• B1686Lamp Dome Input Circuit Open
• B1694Autolamp On Circuit Open