B1530

Code

Other B — Body

Memory Set Switch Circuit Short To Ground

Brand: Other

Type: B — Body

Views: UK: 32 EN: 88 RU: 57

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Page language: EN

Causes

Damaged or chafed wiring shorting to chassis ground
Corroded or bent connector pins contacting ground
Failed memory set switch with internal short
Water intrusion or contamination in switch or connector
Aftermarket accessory or repair introduced a ground fault
Faulty control module (rare)

Symptoms

Memory set function (seat/mirror/steering memory) inoperative
Intermittent or no response when pressing the memory set switch
Possible blown fuse related to memory circuit
Related warning message or lamp and stored DTC
Operation returns to normal after reconnecting harness or temporarily manipulating wiring (intermittent)

What to check

Perform a visual inspection of the memory switch, connector and wiring for damage, corrosion or moisture
Check related fuses and fusible links for open or signs of overheating
Backprobe the switch connector with ignition on and measure reference and signal voltages
With connector disconnected, check continuity between the switch signal pin and chassis ground (should be open/infinite)
Wiggle test wiring harness while monitoring signal to reproduce intermittent shorts

Signal parameters

Reference voltage: typically 5 V (some systems may use ignition-switched 12 V) present at switch connector with ignition ON
Switch closed signal: near 0 V (ground) when intended to be grounded by the switch, otherwise near reference voltage
Open-circuit resistance from signal pin to ground: very high (kΩ / open) with ignition OFF and connector disconnected
Short-to-ground condition: continuity (low ohms) between signal pin and chassis ground with connector connected or during fault

Diagnostic algorithm

Retrieve freeze frame and any related codes; record vehicle symptoms and recent repairs or modifications.
Visually inspect the memory set switch, bezel and connector for damage, corrosion, water entry, or loose pins. Check routing of harness for chafing against body panels or sharp edges.
Check fuses and relays for the memory/comfort system. Replace blown fuses only after diagnosing cause.
With ignition ON, backprobe the switch connector. Verify reference voltage is present at the expected terminal (usually ~5 V or battery voltage depending on system).
Operate the switch while monitoring the signal pin. Confirm signal voltage changes as expected (toggle between reference and ground when pressed).
Turn ignition OFF and disconnect the switch connector. Measure resistance/continuity between the signal pin and chassis ground. A low resistance indicates a short to ground in the switch or downstream wiring.
If short is present with connector disconnected, replace the switch assembly. If short disappears with connector disconnected, isolate wiring between switch and control module using backprobing and sectional continuity tests.
Inspect and repair any damaged wiring, replace corroded terminals or connectors, and properly secure harness away from pinch points. Use dielectric grease if moisture ingress is an issue.
After repair, clear codes and verify repair by cycling ignition and operating memory set functions; perform a road/test cycle as required to confirm no recurrence.
If wiring and switch check OK, consider module input pin test or professional module diagnosis (module faults are uncommon).