Pinpoint Test 4: DTC B1890 - Pad Warning Lamp Circuit Short To Battery
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PINPOINT TEST 4: DTC B1890 - PAD WARNING LAMP CIRCUIT SHORT TO BATTERY
Normal OperationWhen the ignition is in the ON position, the passenger air bag deactivation (PAD) indicator prove-out period is initiated by the restraints control module (RCM). The RCM briefly activates the PAD indicator to verify to the occupants correct functional operation of the PAD indicator. See Description and Operation.
During the PAD prove-out period, if the RCM detects a short to battery on the PAD indicator circuit, it will store DTC B1890 in memory and send a message to the instrument cluster module to illuminate the air bag warning indicator. If the RCM detects a short to battery on the PAD indicator circuit, it sets DTC B1890 PAD Warning Lamp Circuit Short to Battery.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PAD indicator
- RCM
WARNING:Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
WARNING:Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.
CAUTION:Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE:Supplemental restraint system (SRS) components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
NOTE:Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
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