Method For Version 1

Method for fault tracing/calibrating power seats with memory function

Method for Version 1

Applies to:
850, 1993
to chassis No. 055931 incl.

The power seat control module has been fitted with an adapter lead. The following procedure must be used to access the seat diagnostic system:

A1
- Switch off ignition.

A2

A1:

- Disconnect adapter lead from control module at input A.

A3
- Disconnect chassis wiring from adapter lead.

A4
- Connect chassis wiring to input A on control module.

A5

A2:

- Manual fault tracing/calibration: Connect test lead from DLC (diagnostic unit) A to socket No. 6 on DLC B.

- Fault tracing/calibration using Volvo Scan Tool (VST) with On-Board Diagnostic (OBD) System Memory Cassette: Connect instrument to DLC B.

A6

Ignition must be off for at least 5 seconds before performing this step.

A3:

- Press and hold any button on control panel of seat to be tested while switching ignition on. Keep button depressed for at least 1 second after turning ignition on.

A7

A4:

- Diagnostic system must now be activated within one minute, i.e., test button must be pressed once to select diagnostic test mode (DTM) 1 (self-diagnostics) or four times to select test mode 4 (calibration).

Control module will exit diagnostic function after approx. 1 minute if no activity takes place between module and DLC. Module will also exit diagnostic function if ignition is switched off for at least 5 seconds. The seat cannot be operated either with control buttons or memory buttons while using diagnostic system.

Codes for DTM 1 are listed and explained in the table on page 12 of service manual (SM) TP 32187/1; use of DTM 4 (calibration) is described on SM.

A8
On conclusion of work:

- Switch ignition off
- Reconnect adapter lead

A9
- Check operation of power seat.