Check Out These VSA Troubleshooting Tips (B07080B)

Publication date: 2007-08-01
Reference number: B07080B

CHECK OUT THESE VSA TROUBLESHOOTING TIPS

TECHNICAL SERVICE BULLETIN

Reference Number(s): B07080B, Date of Issue: August 01, 2007

ACURA:	'04-08 MDXs; '07-08 RDXs; '05-08 RLs; '02-06 RSXs; '04-08 TLs; and '04-08 TSXs
CURRENTLY APPLIES TO:	'04-08 MDXs; '07-08 RDXs; '05-08 RLs; '02-06 RSXs; '04-08 TLs; and '04-08 TSXs

SERVICE INFORMATION

Vexed by a VSA troubleshooting problem? Here's a handy chart that can help you out. Keep in mind, this is a generic chart, so the DTC ID numbers and descriptions may vary slightly with model applicability. If you've still got the problem after following these troubleshooting tips, then refer to the applicable S/M or go into ISIS for more detailed info.

DTC DESCRIPTION CHART

DTC	Description	Symptom	Probable Cause
U0073 or U0028 with any other DTCs	F-CAN malfunction (Bus-off)	MIL is on No F-CAN communication HDS won't communicate on some models Tachometer, speedometer, and temperature gauge don't work Multiple warning indicators are on Body electrical DTCs B1168, B1169, B1170, and B1178	CAN-H wire shorted to ground CAN-H wire shorted to power Bad F-CAN-related control unit Poor power or ground to an F-CAN-related control unit
U0122 only. No other DTCs.	F-CAN malfunction (PCM-VSA)	MIL is off VSA indicator is on VSA activation indicator is on	Poor or no +B FSR voltage Poor or no Ignition 1 voltage Poor or no VSA ground
U0122 with VSA 86	F-CAN malfunction (PCM-VSA F-CAN communication	MIL is off VSA indicator is on VSA activation indicator is on	Poor or no +B FSR voltage Poor or no Ignition 1 voltage Poor or no VSA ground Open or poor connection on F-CAN-H or F-CAN-L wires
25	Yaw rate sensor	MIL is off VSA indicator is on VSA activation indicator is on	S-GND, YAW, or SVCC open circuit Yaw signal wire shorted to ground Bad yaw rate sensor or cluster sensor
26	Lateral acceleration sensor	MIL is off VSA indicator is on VSA activation indicator is on	S-GND, GLAT, or SVCC open circuit GLAT signal wire shorted to ground Bad yaw rate-lateral acceleration (cluster) sensor
27	Steering angle sensor	MIL is off VSA indicator is on VSA activation indicator is on	Open or poor connection on STRA, STRB, or STRD (STRZ) signal wire Short to ground on STRA, STRB, or STRD (STRZ) signal wire Open on S-GND wire Bad steering angle sensor
28	Longitudinal acceleration sensor	MIL is off VSA indicator is on VSA activation indicator is on	Open or poor connection on GLONG signal wire Short to ground on GLONG signal wire Open on S-GND wire
51	Motor lock	MIL is off VSA indicator is on VSA activation indicator is on	+B-MR open or poor connection Poor or no VSA ground
53	Motor stuck ON	MIL is off VSA indicator is on VSA activation indicator is on	Poor or no VSA MOTOR ground
64	Sensor power voltage	MIL is off VSA indicator is on VSA activation indicator is on	SVCC short to ground or open
68	Brake pedal position switch	MIL is off VSA indicator is on VSA activation indicator is on	If the VSA modulator-control unit sees brake pressure without a brake pedal position switch signal, check for an open in the brake light circuit or a misadjusted brake pedal position switch. If the VSA modulator-control unit sees the brake pedal position switch is on without brake pressure, check for a short to power in the brake pedal position switch circuit or a misadjusted switch.
86	F-CAN communication	MIL is off VSA indicator is on VSA activation indicator is on	Poor or no +B FSR voltage Poor or no Ignition 1 voltage Poor or no VSA ground Open or poor connection on F-CAN-H or F-CAN-L wires

B1170

DTC B1170: Gauge Control Module Lost Communication with VSA Modulator-Control Unit (VSA Message) ('05-08 modes)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Check for DTCs with the HDS.

Is DTC B1170 indicated?

YES - Go to step 4.

NO - Intermittent failure, the F-CAN communication line is OK at this time. Check for DTCs in the ECM/PCM and the VSA modulator-control unit with the HDS. If F-CAN DTCs are present, check for a loose VSA ground or poor connections at the VSA modulator-control unit or gauge control module. If the connections are good, check the battery condition and the charging system, then clear all DTCs.

4. Check for DTCs in the ECM/PCM or VSA with the HDS.

Are any DTCs indicated?

YES - Go to the ECM/PCM or VSA indicated DTCs troubleshooting.

NO - Go to step 5.

5. Do the gauge control module input test.

Are all inputs OK?

YES - Go to step 6.

NO - Repair the faulty input, then recheck the DTCs.

6. Substitute a known-good gauge control module.
7. Clear the DTCs with the HDS.
8. Turn the ignition switch OFF, and then back ON (II).
9. Check for DTCs with the HDS.

Is DTC B1170 indicated?

YES - Recheck the ECM/PCM for DTCs, then recheck the VSA modulator-control unit for DTCs.

NO - The original gauge control module is faulty; replace it.

Supporting Diagrams & Locations

Reference material from the factory manual for this diagnostic procedure.

Diagram

A/C Leak Detection (B07-025)

Diagram

A/C Leak Detection (B07-025)

Location

ACURA

Location

AUDI

Location

BENTLEY

Location

BMW

Fuse/Relay

AUDI

Fuse/Relay

BMW

Fuse/Relay

Buzzers, Relays & Timers

Fuse/Relay

Check Out The Latest Word On A/T Flushing (B08010A)

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B1170

Check Out These VSA Troubleshooting Tips (B07080B)

CHECK OUT THESE VSA TROUBLESHOOTING TIPS

TECHNICAL SERVICE BULLETIN

SERVICE INFORMATION

A L L Diagnostic Trouble Codes ( DTC )

B1170

Supporting Diagrams & Locations

Related Procedures