The ABS control module monitors voltage on circuit 1633 when the enable relay is activated. If voltage is above 17 volts, ABS will be disabled and the antilock telltale lamp will be turned On.

Code 37 sets if:

ABS system voltage is above 17 volts.

This code will set only when vehicle speed is greater than 13 km/h (8 mph) and not in ABS braking.

Check State of battery charge. An overcharged battery may be a symptom of a charging system problem. Refer to "Starting/Charging" section of "Electrical Service Manual."

Using an ohmmeter to check resistance, shake wires to locate intermittents.

When attempting to diagnose an intermittent problem, use the Scan tool to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.

Select Malf History from Scan tool ABS menu.

Intermittents, shorts or opens suspected to be at the connectors can be detected by using a diagnostic service probe. Voltage can be read on wires without disconnecting any connectors