Steering

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PINPOINT TEST 1: DTC B1317 AND B1318 - BATTERY VOLTAGE HIGH AND BATTERY VOLTAGE LOW

Normal Operation

The voltage required for correct electronic power assist steering (EPAS) system operation is 10-16 volts. Above or below that voltage range, DTC B1317 (battery voltage high) or DTC B1318 (battery voltage low) will be set.
Fused ignition voltage for the EPAS system is supplied to the control module by smart junction box (SJB) fuse 35 (10A) along circuit Y/GY. Fused battery voltage for the EPAS system motor is supplied to the power steering control module by battery junction box (BJB) fuse 1 (80A) along circuit (R). Ground for the power steering control module is provided along circuit (B/V).

- DTC B1317 Battery Voltage High - When the battery or charging system voltage exceeds 16 volts for more than 1000 ms, DTC B1317 will be set.
- DTC B1318 Battery Voltage Low - When the battery or charging system voltage drops below 10 volts for more than 4000 ms, DTC B1318 will be set.

Possible Causes
- Wiring, terminals or connectors
- Charging system
- Power steering control module

Diagnostic Procedure

CAUTION:Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

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